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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Spring has arrived as the sun comes out and temperatures rise to 16ºC by Saturday
There'll be a lot of cloud at first this morning but the sun should break through in many places this afternoon.
The cloudy skies will remain tonight but at least temperatures will stay frost-free.