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A flock of geese caused a US military helicopter to crash in Norfolk earlier this year, according to investigators.
The aircraft was on a routine training mission from RAF Lakenheath when it went down on January 7 at Cley-next-the-Sea.
The birds rendered the pilot and co-pilot unconscious.
Captains Christopher Stover and Sean Ruane and Technical Sergeant Dale Mathews were killed, along with their female colleague Staff Sergeant Afton Ponce.
A report by the US Air Force had found that "multiple bird strikes" caused an RAF Lakenheath helicopter to crash at Cley-next-the-Sea in Norfolk in January this year.
Four American servicemen died during the collision.
The report says the pilot and co-pilot were knocked unconscious by the bird strikes.
More details to follow
Latest ITV News reports
A report has found that the military helicopter which crashed on the North Norfolk coast was brought down by a flock of geese.