The Osprey made the landing at the US military's auxiliary airfield on the island of Iejima, west of the northern part of Okinawa's main island, after a cockpit warning light came on, the ministry's Okinawa Defense Bureau said.

No injuries have been reported. The Osprey is expected to return to the Marine Corps' Futenmma air station in the Okinawa city of Ginowan once safety is confirmed.

The defense bureau called on the US side to investigate the cause of the incident and prevent any recurrence. (Jiji Press)