A US military helicopter crash in Norfolk, in which four crew members died, was caused by geese hitting the aircraft.
The HH-60 Pave Hawk helicopter was operating out of RAF Lakenheath in Suffolk when it crashed on January 7 at Cley next the Sea during a routine training exercise.
A report into the crash was compiled by the Accident Investigation Board.
Its report found: "A flock of geese took flight from Cley Marshes, likely startled by the noise of the approaching helicopters, and struck the MA (mishap aircraft).
US airmen Dale Matthews & Sean Ruane were among those who died "At least three geese penetrated the windscreen, rendering the mishap pilot and mishap co-pilot unconscious, and at least one goose struck the mishap aerial gunner in the performance of special mission aviator duties, rendering the mishap aerial gunner unconscious.
"In addition, at least one goose hit the nose of the MA, disabling the trim and flight path stabilisation systems."
As a result of the pilot and co-pilot being unconscious and the stabilisation systems disabled, the helicopter's control stick would have moved randomly, the report added.
The crew were flying over marshland and a nature reserve The helicopter banked to the left and, unable to lift vertically, hit the ground within about three seconds of being hit by the geese.
Captains Christopher S Stover and Sean M. Ruane, technical sergeant Dale E. Mathews and staff sergeant Afton M. Ponce, who served with 56th Rescue Squadron, 48th Fighter Wing on search and rescue operations, were all killed.
Local councillor Richard Kelham said residents had been worried for a long time about low-flying helicopters going over a Norfolk Wildlife Trust bird reserve.
"These findings strengthen our hand in the argument against low flying over nature reserves," he said.
"It is inherently dangerous to fly low over an area with a lot of birds and hopefully lessons can be learned from this tragedy."
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