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British police said four people are believed dead after a U.S. Air Force helicopter crashed along the eastern coast of England on Tuesday night.

The HH-60G Pave Hawk, a version of the Black Hawk, crashed off the Cley coastal area of Norfolk county. The helicopter was based at the Royal Air Force base at Lakenheath in Suffolk, a U.S. Air Force spokesman told the BBC.

Initial reports indicated the four-person aircraft had crashed into the North Sea, but it later confirmed it came down over land, the Royal National Lifeboat Institution said.

The HH-60G Pave Hawk is primarily used for search and rescue and to remove combat forces "under stressful conditions."