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Norfolk US helicopter crash: Debris covers "size of a football field"

8 January 2014 Last updated at 09:50 GMT

Investigations have started into what caused a US Air Force helicopter to crash in Norfolk, killing all four people on board.

The HH-60G Pave Hawk, based at RAF Lakenheath in Suffolk, came down at a nature reserve in Cley next the Sea on Tuesday night.

The aircraft, assigned to the 48th Fighter Wing, was on a low-level training mission.

Debris from the crash "on difficult terrain in the marsh" is spread over an area "about the size of a football field", said Norfolk Police.