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.

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

Search teams included aircraft and small boats.