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
More top news
Skies will turn increasingly cloudy. Patchy rain will from west to east during the late afternoon, clearing by the evening.
Scientists in Cambridge are to be given £1.75 million pounds to find ways to treat and prevent dementia.
The County Council has just approved the final phase of a scheme to get more residents and businesses superfast broadband.