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
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A dry night with broken cloud and occasional clear spells. Generally cloudy with occasional outbreaks of rain during Thursday morning.