Update: A U.S. Military Osprey aircraft with eight people on board crashed in Japan.

A U.S. military Osprey aircraft with eight people on board crashed into the sea off southern Japan during a training mission, the Air Force said.

The condition of the airmen is very delicate,5 marines killed the Air Force Navy Officials said, the Japanese coast guard said one person was confirmed dead, with search and rescue efforts continuing.

Authorities are doing all they can to ensure  rescuing the rest of the men on board.