"The US Marine Corps confirms that two Marines have been found. One is in fair condition and the other is being transported to a local hospital for evaluation," the Marine Corps said in a statement cited by Efe news.
"The search and rescue operations continue for the remaining five US Marines," it added.
The accident took place around 2 a.m. about 320 km off the coast of western Japan, when a FA-18 Hornet fighter jet and a KC-130 Hercules transport plane, which had taken off from the Marine Corps Air Station Iwakuni, collided while "conducting routine training and aerial refuelling", according to the statement.
It was believed that five crew were on board the KC-130 and two on the F/A-18 at the time of the crash, US defence officials told CNN. The circumstances surrounding the accident were being investigated.
Thursday's accident came two weeks after another US FA-18 fighter jet crashed into the sea off Naha, the capital of Okinawa Prefecture, in the southwest of Japan, after taking off from the USS Ronald Reagan nuclear-powered aircraft carrier, but there were no casualties.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)