There were eight people on board the plane but the condition of the five people on board was not immediately known.

There were eight people on board the plane but the condition of the five people on board was not immediately known.

After which the American Army later revised this number to six.

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

Coast guard aircraft and patrol boats found one person, who was later pronounced dead at a nearby hospital, Ogawa said.

The government will confirm information about the damage and give top priority to saving lives," Chief Cabinet Secretary Hirokazu Matsuno told reporters.

The Osprey is a hybrid aircraft that takes off and lands like a helicopter, but can rotate its propeller forward during flight.

It was the fifth fatal accident involving a Sea Osprey since 2012, bringing the death toll at that time to at least 19.