Real estate mogul Donald Trump has taken a major step toward a potential run for the White House in 2016.
The Apprentice star announced on Wednesday he is forming a presidential exploratory committee.
"I am the only one who can make America truly great again," Mr Trump said in a statement.
The move is a firm step for the billionaire businessman, who has long flirted with a bid for the White House.
Several Republicans are expected to make a run in 2016
"I have a great love for our country, but it is a country that is in serious trouble," he said.
"Americans deserve better than what they get from their politicians who are all talk and no action."
Video:Unofficial White House Race Begins
Launching an exploratory committee allows Mr Trump to raise money and hire staff.
The Republican has already hired political aides in three key states on the presidential nomination calendar, including Iowa, New Hampshire and South Carolina.
He is scheduled to appear in New Hampshire later in the week.
Mr Trump has been a sharp critic of Barack Obama's policies, but most notably garnered attention for raising questions about whether the President was born in the United States.
Mr Obama eventually released his long-form birth certificate to end the controversy.
Mr Trump joins fellow Republicans Jeb Bush and retired neurosurgeon Ben Carson as the only potential candidates to form exploratory committees at this stage.
Several other Republicans are expected to officially throw their hats in the ring in the coming months, with all signs pointing to a likely 2016 race against Democrat Hillary Clinton.
Mrs Clinton, who is in the midst of a scandal involving her use of private email during her time as Secretary of State, has not yet formally announced her bid.
Japanese police are investigating phone calls in which death threats were made against US Ambassador Caroline Kennedy.
Authorities in Tokyo said that the calls were made to the US Embassy and threatened to kill Ms Kennedy, the daughter of US President John F Kennedy and First Lady Jacqueline.
Caroline Kennedy was named US envoy in 2013
Similar calls threatened Alfred Magleby, the US consul general based on the southern island of Okinawa, where 25,000 American troops are based.
"We take any threats to US diplomats seriously," State Department spokeswoman Jen Psaki said in a statement on Wednesday.
Video:US Ambassador Has Face Slashed
She did not confirm any specific threats to Ms Kennedy or Mr Magleby.
"We are working with the Japanese government to ensure the necessary measures are in place," she said.
Earlier this month, the US ambassador to South Korea, Mark Lippert, was knifed by an anti-American activist in Seoul and had to spend several days in hospital.
Japanese media reports said that the death threats came last month from a caller speaking in English, and that police were looking into the case on suspicion of blackmailing.
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Video:Anti-Capitalist Rally Turns Violent
Violent clashes have broken out in Germany's financial capital during anti-capitalist protests marking the opening of the European Central Bank's new headquarters.
Police in Frankfurt say they have detained about 350 people after demonstrators became "aggressive and violent" in the early hours of the morning.
More than 90 officers were reportedly injured after police and firefighters came under attack from activists throwing stones and hurling "unidentified liquids".
A 'capitalism kills' banner has been erected near the ECB Pic: @khusain
A number of cars were also torched across the city, including three police patrol vehicles which were set alight during an attack on a central police station.
The police and fire departments both issued appeals on Twitter, urging protesters to remain calm.
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Gallery: Frankfurt In Flames As ECB Building Protests Turn Violent
Members of the so-called "Blockupy alliance" have staged protests against austerity and the authority of the European Central Bank ahead of its new headquarters officially opening in Frankfurt, Germany
A policeman stops an anti-capitalist protester near the ECB building
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Protesters climb one of the Frankfurt towers. Pic@ @khusain
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Four German police cars set on fire by protesters burn near the ECB building
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Riot police clash with protesters dressed as clowns. Continue through for more pictures
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"Our firefighters are being attacked. Please stop doing that!" Frankfurt Fire Department tweeted.
Shortly before the ECB building's inauguration, police deployed water cannon to disperse groups of protesters gathered outside the security zone around the 185-metre (605ft) new skyscraper.
Later, some 10,000 people, under the "Blockupy" banner, took part in an afternoon procession across the city.
Reports that thousands were expected to join the rally, prompted authorities to organise a major police presence throughout the day.
"It is one of the biggest deployments ever in the city," a police spokeswoman told news agency AFP.
Blockupy, which brings together an alliance of anti-capitalist and anti-austerity groups from across Europe, has repeatedly organised protests in Frankfurt's banking district since 2012.
The organisation is targeting the ECB over its role in imposing austerity measures on financially troubled countries like Greece.
On its official Twitter page, the group accused police of brutality, claiming several people had been injured.
"Stop police violence," it wrote.
Meanwhile activists have erected a banner reading "capitalism kills" in view of the new building.
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Frankfurt In Flames Amid Anti-Capitalist Rally
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Video:Anti-Capitalist Rally Turns Violent
Violent clashes have broken out in Germany's financial capital during anti-capitalist protests marking the opening of the European Central Bank's new headquarters.
Police in Frankfurt say they have detained about 350 people after demonstrators became "aggressive and violent" in the early hours of the morning.
More than 90 officers were reportedly injured after police and firefighters came under attack from activists throwing stones and hurling "unidentified liquids".
A 'capitalism kills' banner has been erected near the ECB Pic: @khusain
A number of cars were also torched across the city, including three police patrol vehicles which were set alight during an attack on a central police station.
The police and fire departments both issued appeals on Twitter, urging protesters to remain calm.
1/34
Gallery: Frankfurt In Flames As ECB Building Protests Turn Violent
Members of the so-called "Blockupy alliance" have staged protests against austerity and the authority of the European Central Bank ahead of its new headquarters officially opening in Frankfurt, Germany
A policeman stops an anti-capitalist protester near the ECB building
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Protesters climb one of the Frankfurt towers. Pic@ @khusain
]]>
Four German police cars set on fire by protesters burn near the ECB building
]]>
Riot police clash with protesters dressed as clowns. Continue through for more pictures
]]>
"Our firefighters are being attacked. Please stop doing that!" Frankfurt Fire Department tweeted.
Shortly before the ECB building's inauguration, police deployed water cannon to disperse groups of protesters gathered outside the security zone around the 185-metre (605ft) new skyscraper.
Later, some 10,000 people, under the "Blockupy" banner, took part in an afternoon procession across the city.
Reports that thousands were expected to join the rally, prompted authorities to organise a major police presence throughout the day.
"It is one of the biggest deployments ever in the city," a police spokeswoman told news agency AFP.
Blockupy, which brings together an alliance of anti-capitalist and anti-austerity groups from across Europe, has repeatedly organised protests in Frankfurt's banking district since 2012.
The organisation is targeting the ECB over its role in imposing austerity measures on financially troubled countries like Greece.
On its official Twitter page, the group accused police of brutality, claiming several people had been injured.
"Stop police violence," it wrote.
Meanwhile activists have erected a banner reading "capitalism kills" in view of the new building.
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Video:Netanyahu Wins Israeli Election
Benjamin Netanyahu's Likud party has scored a resounding victory in Israel's election, final results show.
With nearly all the votes counted, Likud appeared to have earned 30 of parliament's 120 seats.
Exit polls had shown a tight race with Isaac Herzog's Zionist Union, but the centre-left party ended up with just 24 seats.
Mr Herzog told reporters: "A few minutes ago I spoke with Prime Minister Benjamin Netanyahu and congratulated him on his achievement and wished him luck."
Isaac Herzog and Tzipi Livni, his co-leader of the Zionist Union party
Mr Netanyahu will now set about putting together a coalition government with right-wing and religious allies.
The win comes after he moved to the right in the final days of campaigning, including abandoning a commitment to negotiate a Palestinian state.
1/17
Gallery: Israel Goes To The Polls In Tight Election
Israel's Prime Minister Benjamin Netanyahu casts his vote in Jerusalem
An Israeli soldier choosing a ballot from behind a voting booth near Ofakim
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Isaac Herzog, co-leader of centre-left Zionist Union party, poses for a photograph at his party's headquarters in Tel Aviv
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Mr Herzog places a note in the Western Wall, the holiest prayer site for Jews in Jerusalem
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A supporter of the ultra-Orthodox Shas party holds a campaign poster in Bnei Brak
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In a four-day pre-election blitz, he made a series of promises designed to shore up his Likud base and draw voters from other right-wing and nationalist parties.
As well as ruling out a Palestinian state, he also pledged to continue building settlements on occupied land.
His victory is likely to mean continued tensions with the United States, which has had an increasingly fraught relationship with Mr Netanyahu.
The win was unexpected as the last opinion polls published four days before the vote showed the Zionist Union with a four-seat advantage over Likud.
In a statement, Likud said Mr Netanyahu intended to form a new government within weeks, with negotiations already under way with the pro-settler Jewish Home party led by Naftali Bennett, and with religious groups.
The critical party to get on side will be centrist Kulanu, led by former Likud member Moshe Kahlon, who won 10 seats, making him a kingmaker given his ability to side with either Mr Netanyahu or the centre-left opposition.
"Against all odds, we achieved a great victory for the Likud," Mr Netanyahu said.
"I am proud of the people of Israel, who in the moment of truth knew how to distinguish between what is important and what is peripheral, and to insist on what is important.
"Reality is not waiting for us. The citizens of Israel expect us to quickly put together a leadership that will work for them regarding security, economy and society as we committed to do - and we will do so."
If he manages to form a workable coalition, it would give Mr Netanyahu a fourth term in office after the six years he has already spent in power.
It puts him on track to become Israel's longest-serving prime minister, a position currently held by the country's founding father and first prime minister, David Ben-Gurion, who served between from 1948 to 1954 and from 1955 to 1963.
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Netanyahu's Likud Party Wins Israeli Election
We use cookies to give you the best experience. If you do nothing we'll assume that it's ok.
Video:Netanyahu Wins Israeli Election
Benjamin Netanyahu's Likud party has scored a resounding victory in Israel's election, final results show.
With nearly all the votes counted, Likud appeared to have earned 30 of parliament's 120 seats.
Exit polls had shown a tight race with Isaac Herzog's Zionist Union, but the centre-left party ended up with just 24 seats.
Mr Herzog told reporters: "A few minutes ago I spoke with Prime Minister Benjamin Netanyahu and congratulated him on his achievement and wished him luck."
Isaac Herzog and Tzipi Livni, his co-leader of the Zionist Union party
Mr Netanyahu will now set about putting together a coalition government with right-wing and religious allies.
The win comes after he moved to the right in the final days of campaigning, including abandoning a commitment to negotiate a Palestinian state.
1/17
Gallery: Israel Goes To The Polls In Tight Election
Israel's Prime Minister Benjamin Netanyahu casts his vote in Jerusalem
An Israeli soldier choosing a ballot from behind a voting booth near Ofakim
]]>
Isaac Herzog, co-leader of centre-left Zionist Union party, poses for a photograph at his party's headquarters in Tel Aviv
]]>
Mr Herzog places a note in the Western Wall, the holiest prayer site for Jews in Jerusalem
]]>
A supporter of the ultra-Orthodox Shas party holds a campaign poster in Bnei Brak
]]>
In a four-day pre-election blitz, he made a series of promises designed to shore up his Likud base and draw voters from other right-wing and nationalist parties.
As well as ruling out a Palestinian state, he also pledged to continue building settlements on occupied land.
His victory is likely to mean continued tensions with the United States, which has had an increasingly fraught relationship with Mr Netanyahu.
The win was unexpected as the last opinion polls published four days before the vote showed the Zionist Union with a four-seat advantage over Likud.
In a statement, Likud said Mr Netanyahu intended to form a new government within weeks, with negotiations already under way with the pro-settler Jewish Home party led by Naftali Bennett, and with religious groups.
The critical party to get on side will be centrist Kulanu, led by former Likud member Moshe Kahlon, who won 10 seats, making him a kingmaker given his ability to side with either Mr Netanyahu or the centre-left opposition.
"Against all odds, we achieved a great victory for the Likud," Mr Netanyahu said.
"I am proud of the people of Israel, who in the moment of truth knew how to distinguish between what is important and what is peripheral, and to insist on what is important.
"Reality is not waiting for us. The citizens of Israel expect us to quickly put together a leadership that will work for them regarding security, economy and society as we committed to do - and we will do so."
If he manages to form a workable coalition, it would give Mr Netanyahu a fourth term in office after the six years he has already spent in power.
It puts him on track to become Israel's longest-serving prime minister, a position currently held by the country's founding father and first prime minister, David Ben-Gurion, who served between from 1948 to 1954 and from 1955 to 1963.
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Benjamin Netanyahu issued a desperate call on his supporters to turn out in Israel's elections by raising the entirely unproven spectre of Arab voters being bussed to polling stations with funds supplied by foreign governments.
The day before, he reached out to the right with a promise - that there will not be a Palestinian state on his watch as Prime Minister.
These were signs of desperation, but it proved to be a tactical masterstroke.
He has won 30 seats in the Knesset, almost guaranteeing that he will be able to knit a stable coalition of the right - returning him to office for a record fourth term.
For Israel and the Palestinians though, these extreme tactics may prove to be strategic errors.
Video:Likud Win 'Something Of A Shock'
Within the borders of the Zionist state, Israel's Arabs - who represent a fifth of the population - already complain of being second-class citizens. Now, they have been officially designated as political enemies by their own Prime Minister.
The joint Arab list of candidates has emerged, with 14 seats, as the third political force in Israel.
It's a fragile alliance of disparate interests that may not survive - but the casual racism of the Israeli Prime Minister's statements may continue to galvanise a fierce opposition from them.
On the West Bank, though, Netanyahu's boast that there will be no two-state solution has already begun to boom across the landscape.
The Palestine Liberation Organisation has already decided to end co-operation with Israel on security matters. The president of the Palestinian Authority, Mahmoud Abbas, may soon decide to implement this ruling.
If he does, then collaboration between Israel's occupation forces and the PA's police and secret agents - who combat and arrest militants planning attacks on Israelis - will end.
This would be a popular move among Palestinians who know that there is no prospect of an end to the occupation and independence, will see their own government as little better than France's wartime Vichy government.
Palestinian officials have also said that they are now planning to intensify their diplomat initiatives to secure recognition of a Palestinian State from international bodies, and to join the International Criminal Court.
Video:'Against All Odds, A Great Victory'
Washington and many EU countries have warned against such unilateral moves.
But if there is no process for peace and no prospect of a Palestine, they are likely to change their position.
It is not inconceivable that the many millions spent on the West Bank by foreign donors will begin to be seen as underwriting the occupation rather than contributing towards the growth of a viable Palestinian state.
If that happens, it may be drastically reduced - forcing a cash-strapped Israel back into paying for the everyday costs of occupation.
A Third Intifada now looms on the horizon of the West Bank.
Israel risks being seen as a pariah "apartheid" state - terms that political leaders and diplomats have been freely using in private to describe Israel for some time.
The nascent right-wing coalition is now welded to a position on the Palestinians that can only result in international isolation, and this could lurch into outright hostility - even among traditional supporters.
That is going to be bad for both Israelis and Palestinians - most of whom, ironically, still support a long-term peace deal between them based on independent states for both.
Prosecutors have made the first arrests over the 1995 Srebrenica massacre.
Serbian police arrested eight men accused of taking part in the slaughter of more than 1,000 Muslim men and boys at a warehouse on the outskirts of Srebrenica.
Bosnian Muslims pray during a mass funeral for newly identified victims
Altogether, more than 8,000 Bosnian Muslim men and boys were killed in the eastern Bosnian enclave by the Serbs – the worst civilian slaughter since World War II.
Serbian prosecutors said they initially arrested seven suspects in pre-dawn raids at different locations in Serbia.
An eighth suspect was later arrested after a manhunt.
Mejra Cakanovic holds up pictures of her late husband and two sons
There are reports all those arrested are former members of a special brigade of the Bosnian Serb police.
AP reported that amongst those arrested were Nedeljko Milidragovic, the commander known as "Nedjo the Butcher".
A dutch peacekeeper in the nearby village of Potocari in 1995
Bruno Vekaric, lead Serb prosecutor, said: "It is important to stress that this is the first time that our prosecutor's office is dealing with the mass killings of civilians and war prisoners in Srebrenica.
"We have never dealt with a crime of such proportions. It is very important for Serbia to take a clear position toward Srebrenica through a court process."
In 2011, Serbia handed over the former Bosnian Serb commander Ratko Mladic. Accused of masterminding the Srebrenica massacre, he is currently being tried in The Hague.
Serbia's government is thought to be supporting the arrests as part of its quest to join the EU.
A man walks past a plaque with the estimated number of those killed
A UN court ruled the Srebrenica massacre carried out over several days after the fall of the UN "safe haven" constituted genocide.
In July 1995, Bosnian Serb forces ignored Dutch UN peacekeeping troops stationed in Srebrenica.
The Serbs – led by Milidragovic – marched into the town without meeting any resistance.
Women sought shelter at the Dutch base while Bosnian men and boys fled into the surrounding woods and were hunted down by Mladic's forces.
July will mark the 20th anniversary of the massacre.
Almost 90% of the victims have been exhumed from mass graves and identified through DNA analysis.
Nineteen people have been killed after militants attacked a museum in the Tunisian parliament building compound, the country's prime minister has said.
Initial reports on local media said those killed included British nationals, but the Tunisian prime minister Habib Essid told national television the victims were Polish, Spanish, German, Italian and Tunisian, including 17 tourists.
The gunmen held hostages inside the Bardo Museum, but security forces surrounded the building and later stormed it, killing two militants.
One policeman was killed along with a cleaner during the operation.
The interior ministry said Tunisian troops freed all the hostages, but there were reports that security forces were hunting as many as three gunmen believed to still be at large.
People were taken hostage at the Bardo Museum. Pic: VbTunisia.com
AFP news agency reported that at least two men armed with Kalashnikov assault rifles were involved in the attack.
French Prime Minister Manuel Valls confirmed that hostages had been taken during the attack.
Video:Special Report: Tunisian Jihadis
Speaking in Brussels, he said: "I condemn this terrorist attack in the strongest terms. There has been a hostage-taking, without doubt tourists have been affected, killed."
The museum is a leading tourist attraction in the country, and houses one of the world's largest Roman mosaic collections.
Gavin Stoddart, a British tourist who left the museum 15 minutes before the attack, said he was made to return to his cruise ship after the tour guide got a phone call.
He told Sky News: "Tour guide didn't know reason. All coaches returned to ship very quickly.
"They're doing a ship-wide announcement about it all now. I don't think everyone is back on board.
"It just said there is extra security and we can see police boats around the ship now."
Costa Crociere, owners of the cruise liner Costa Fascinosa which docked in Tunis on Wednesday morning, said some of its 3,161 passengers were visiting Tunis and a tour of the Bardo museum was part of the itinerary.
1/22
Gallery: Eight Tourists Killed In Tunisia Militant Attack
Tunisian security forces attempt to secure the area after gunmen attacked Tunis' famed Bardo Museum
At least seven foreigners and a Tunisian were killed in an attack on the museum by two men armed with assault rifles, the interior ministry said
French satirist Dieudonné has been given a suspended two-month sentence following a posting on Facebook.
The controversial comedian wrote "I feel like Charlie Coulibaly" on Facebook in January, shortly after the Paris attacks in which 17 people were killed.
The words combined the slogan "Je suis Charlie" that was used after the murders of the journalists working for Charlie Hebdo magazine and the surname of Amedy Coulibaly, the Islamist who killed a policewoman and four Jews in an attack on a Jewish supermarket.
Prosecutor Annabelle Philippe had accused Dieudonné of presenting "in a favourable light the acts committed by Amedy Coulibaly" and seeming to be in sympathy with the attacker.
She had called for a fine of €30,000 (£21,125), which, if not paid, could be made into a prison term.
Video:Dieudonne 'Innocent': Lawyer
But the satirist insisted he "condemned the attacks without any restraint and without any ambiguity".
The comedian is no stranger to controversy, having first made national headlines with his trademark "quenelle" hand gesture that seems to be an inverted Nazi salute.
He insisted it was nothing of the kind, merely a demonstration of his anti-establishment credentials.
1/15
Gallery: France Queues At Newstands For Charlie Hebdo
A queue of people wait outside a kiosk to get a copy of Charlie Hebdo in Saint Germain en Laye, France
People wait outside a newsagents in Paris. The latest edition of Charlie Hebdo since Islamist attacks on the magazines offices left 12 people dead has sold out in many parts of France
A court in Germany has renewed a nationwide ban on private drivers using the Uber taxi service, UberPOP.
The regional court in Frankfurt ruled that UberPOP, which links private drivers with passengers via the Uber smartphone application, does not comply with German or European licensing laws.
Each violation of the order will result in a 250,000 euro (£181,000) fine, the three-judge panel agreed.
The Uber app allows users across major cities in more than 50 countries to order a car at the touch of a button.
The German version of the app served both private drivers, via UberPOP, and licensed, professional taxi and limousine drivers who will not be affected by the ruling.
A spokesman for Uber said the company was likely to appeal the decision.
Ahead of the decision, presiding judge Joachim Nickel told the court the UberPOP service is "a violation of the passenger transport law because drivers operate without authorisation".
Lawyers representing Uber argued the service was not subject to the same rules as taxi operators as the company only served as a means of connecting drivers with clients.
However judge Uwe Eilers replied: "In that case, you should include in your business description that Uber offers rides for free".
The ruling comes some six months after the Frankfurt court first issued a temporary injunction against UberPOP.
It later agreed to a temporary reprieve on the grounds that the case deserved a wider airing in court.
The case, brought by German taxi operator group Taxi Deutschland, is one of more than a dozen lawsuits which have been filed in countries across Europe against Uber in recent months.
There is considerable backlash against Uber in the Netherlands and Spain, while France has effectively banned its service.
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The Eiffel Tower is hidden by a haze of smog
A reduced speed limit has been imposed in Paris because of concerns about rising levels of pollution.
The situation is so bad that the Eiffel Tower disappeared into a brown smog, according to reports.
How the tower should look - pictured on a clear day
Much of northern France has also been hit by the rise.
Police have put in place a 12mph (20kph) limit for roads in and around the capital.
1/13
Gallery: Before And After Images Taken From Space
Lake shrinkage, Iraq, between 1995 and 2013. Credit: USGS and Nasa. Changes in water levels around the world have been blamed on climate change - and a new report suggests worse is yet to come.
Columbia Glacier Retreat, Alaska. How it looked in 1985 and 2012. Picture: Google/Landsat.
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These images show the growth of Beijing from 1977 to 2011. Air pollution is a major problem in the city. Picture: USGS.
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This shows the scale of deforestation in Argentina between 1972 and 2009. Picture: United Nations Environment Programme (UNEP).
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Water level changes at a lake in New Mexico between 1994 and 2013. Picture: Nasa Earth Observatory.
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The public have also been ordered to stop burning rubbish.
The steps come after the capital's air quality monitoring agency, AirParif, said air pollution had hit a "high".
It blamed the rise on increased emissions from agricultural activity and more traffic on the roads.
The agency said: "The pollution levels are consistent.
"If we don't go over the alert level, we won't be far away."
Video:Humans 'Deny' Environmental Threats
The city saw a similar spike last year and, as a result, imposed a temporary cut in the number of vehicles allowed on the roads.
As well as imposing restrictions on the number of cars permitted to drive, other measures open to the Paris authorities include making public transport free.
The pollution alert comes ahead of a two-week UN climate conference due to be held in Paris in November.
A World Health Organisation report in 2011 recorded Ahvaz in Iran as the world's most polluted city.
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Paris Cuts Speed Limit Over Pollution Fears
We use cookies to give you the best experience. If you do nothing we'll assume that it's ok.
The Eiffel Tower is hidden by a haze of smog
A reduced speed limit has been imposed in Paris because of concerns about rising levels of pollution.
The situation is so bad that the Eiffel Tower disappeared into a brown smog, according to reports.
How the tower should look - pictured on a clear day
Much of northern France has also been hit by the rise.
Police have put in place a 12mph (20kph) limit for roads in and around the capital.
1/13
Gallery: Before And After Images Taken From Space
Lake shrinkage, Iraq, between 1995 and 2013. Credit: USGS and Nasa. Changes in water levels around the world have been blamed on climate change - and a new report suggests worse is yet to come.
Columbia Glacier Retreat, Alaska. How it looked in 1985 and 2012. Picture: Google/Landsat.
]]>
These images show the growth of Beijing from 1977 to 2011. Air pollution is a major problem in the city. Picture: USGS.
]]>
This shows the scale of deforestation in Argentina between 1972 and 2009. Picture: United Nations Environment Programme (UNEP).
]]>
Water level changes at a lake in New Mexico between 1994 and 2013. Picture: Nasa Earth Observatory.
]]>
The public have also been ordered to stop burning rubbish.
The steps come after the capital's air quality monitoring agency, AirParif, said air pollution had hit a "high".
It blamed the rise on increased emissions from agricultural activity and more traffic on the roads.
The agency said: "The pollution levels are consistent.
"If we don't go over the alert level, we won't be far away."
Video:Humans 'Deny' Environmental Threats
The city saw a similar spike last year and, as a result, imposed a temporary cut in the number of vehicles allowed on the roads.
As well as imposing restrictions on the number of cars permitted to drive, other measures open to the Paris authorities include making public transport free.
The pollution alert comes ahead of a two-week UN climate conference due to be held in Paris in November.
A World Health Organisation report in 2011 recorded Ahvaz in Iran as the world's most polluted city.
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Breaking News: Osborne's 'Political' Pitch For Old And Young
Breaking News: Live Reaction: Chancellor's 2015 Budget
Breaking News: Budget 2015: The Key Points You Need To Know
Breaking News: Seventeen Tourists Killed In Tunisia Attack
