MANAMA, Bahrain — The U.S. Navy said a helicopter crashed in the Red Sea and a search is underway for five crew members aboard.

A statement from the Bahrain-based 5th Fleet says the MH-60S Knighthawk went down Sunday in the central Red Sea while operating with the destroyer USS William P. Lawrence.

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The Navy says an investigation is underway, but there was no hostile activity involved.

Search teams included aircraft and small boats.