Britain investigating USAF helicopter crash

British investigators Wednesday were trying to establish what caused a U.S. Air Force helicopter to crash in a bird sanctuary during a "low-level" training mission along the eastern coast of England in which four crewmembers died. The HH-60G Pave Hawk, an updated version of the U.S. Army Black Hawk, went down in the Cley Marshes nature reserve on Tuesday evening, in Norfolk.

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