Japan's coast guard has found a person and debris in the ocean where a U.S. military Osprey aircraft carrying eight people crashed Wednesday off southern Japan

The cause of the crash and the status of the person and the others on the aircraft were not immediately known, coast guard spokesperson Kazuo Ogawa said.

The coast guard received an emergency call from a fishing boat near the crash site off Yakushima, an island south of Kagoshima on the southern main island of Kyushu, he said.

Coast guard aircraft and patrol boats found one person, whose condition was not immediately known, and gray-coloured debris believed to be from the aircraft, Ogawa said. They were found at sea about 1 kilometer (0.6 mile) off the eastern coast of Yakushima.

The Osprey is a hybrid aircraft that takes off and lands like a helicopter, but during flight can rotate its propellers forward and cruise much faster like an airplane. Versions of the aircraft are flown by the U.S. Marine Corps, Navy and Air Force.

Ogawa said the aircraft had departed from the U.S. Marine Corps Air Station Iwakuni in Yamaguchi prefecture and crashed on its way to Kadena Air Base on Okinawa. The Osprey apparently attempted to make an emergency landing at the Yakushima airport before crashing, he said.

U.S. and Japanese officials said the aircraft belonged to Yokota Air Base in western Tokyo. U.S. Air Force officials at Yokota said they were still confirming information and had no immediate comment.

A U.S. Marine Corps Osprey aircraft with 23 Marines aboard crashed on a north Australian island in August, killing at least three and critically injuring at least five during a multinational training exercise.