A service member remains missing after a U.S. Black Hawk helicopter crashed off the coast of Yemen during what officials described as a training exercise.
A search is ongoing for the missing service member, and the USA military said it will investigate the incident.
Five other Americans were rescued immediately after the helicopter went down about 20 miles off the coast of Yemen, according to The Wall Street Journal, citing reports from U.S. Central Command.
Asked if the crash involved another special forces raid, Central Command told The Associated Press that "this was a routine training event specifically for USA military personnel".
Yemen is located in the southern end of the Arabian Peninsula.
The reported cited the USA army source as saying that this was a routine training event.
A small team of U.S.
The crash isn't the first one for a military helicopter in 2017.
Since Feb. 28, the USA has carried out at least 80 airstrikes in Yemen, including close-air support for UAE and Yemeni government forces.
A small number of USA troops were on the ground in Yemen earlier this month to provide "intelligence sharing" with government forces battling al-Qaida loyalists there, the Washington Post reported. "Commanders deemed this location appropriate and safe for a routine training event", Centcom said, "considering both the operational environment and weather conditions at the time".
The cause of the Black Hawk's crash has also yet to be determined.
Also this month, a Marine Corps MV-22 Osprey crashed off the coast of Australia.