BERLIN (AP/WNCN) — Five U.S. servicepeople were killed when a military helicopter crashed over the eastern Mediterranean Sea during a training mission, U.S. officials said Sunday.

The military’s European Command said all five crew members on board were killed when the aircraft went down “during a routine air refueling mission as part of military training.”

The Washington Post reported the service members who died were U.S. Army Special Operations troops. Stars and Strips also reported those who died were U.S. Army Special Operations soldiers.

According to a DOD release, the deceased are:

  • Chief Warrant Officer 3 Stephen R. Dwyer, 38 of Clarksville, Tennessee
  • Chief Warrant Officer 2 Shane M. Barnes, 34, of Sacramento, California
  • Staff Sgt. Tanner W. Grone, 26, of Gorham, New Hampshire
  • Sgt. Andrew P. Southard, 27, of Apache Junction, Arizona
  • Sgt. Cade M. Wolfe, 24, of Mankato, Minnesota.

The New York Times reported the Fort Liberty-based Delta Force of the Army and the Navy’s SEAL Team 6 were deployed to Cyprus in response to the Israel-Hamas war.

The military first announced the crash on Saturday and said that the cause is under investigation, but there are no indications of any hostile activity involved. It said on Sunday that “search and rescue efforts began immediately, including nearby U.S. military aircraft and ships.”

The Post, which spoke to two U.S. officials, also reported the aircraft that went down was an MH-60, a variant of the Black Hawk helicopter.

U.S. Defense Secretary Lloyd Austin said in a statement that “we mourn the tragic loss of five U.S. service members during a training accident in the Mediterranean Sea early Saturday morning.”

“While we continue to gather more information about this deadly crash, it is another stark reminder that the brave men and women who defend our great nation put their lives on the line each and every day to keep our country safe,” he said.

European Command said that out of respect for the families of the service members and in line with Department of Defense policy, the identities of the crew members are being withheld for 24 hours until the families of those killed have been notified.

It wasn’t immediately clear which military service the aircraft belonged to. The Air Force has sent additional squadrons to the region and the USS Gerald R. Ford aircraft carrier, which has an array of aircraft on board, has also been operating in the eastern Mediterranean.