South African police are questioning three people over the deaths of two toddlers who were found in a communal toilet, sparking violent protests and looting.
Angry residents in the Diepsloot township north of Johannesburg barricaded roads, set fire to tyres and stoned vehicles after the girls, two cousins aged two and three, were discovered.
Shops belonging to foreign nationals were looted, according to reports.
The protesters accused police of failing to provide security for their community.
Gauteng police said they were investigating if the girls - identified as Yonelisa and Zandile Mali - had been sexually assaulted before they were killed.
They also told reporters they were searching for a fourth person in connection with the investigation.
The two girls had been reported missing at the weekend and were found in the toilet cubicle in the early hours of Tuesday.
Last month, the body of a five-year-old girl was found in a skip in the same area.
Diepsloot is an impoverished area of Johannesburg. Pic: File Diepsloot, which borders one of the country's wealthiest gated estates, Dainfern, is among the most impoverished areas in Johannesburg.
Some parts of the township have no running water and residents share pit latrines or mobile toilets.
President Jacob Zuma urged South Africans not to take the law into their own hands.
"These gruesome incidents of extreme torture and murder of our children do not belong to the society that we are continuously striving to build together," he said.
"We condemn these murders in the strongest possible terms."
In a separate case, the bodies of two other children were found in a field in Katlehong township in East Rand, Gauteng province.
The children, aged one and three, were found next to their mother, who had been critically injured, according to iAfrica.com.
Police Colonel Katlego Mogale said: "It appears as if they were dropped by the husband in an open place and then the husband drove away. They are all Mozambican nationals."
The death of a young boy whose body, bearing marks of torture, was found in a field east of Johannesburg is also being investigated by police.
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