Two U.S. military Osprey aircraft made emergency landings at airports on islands in southwestern Japan on Tuesday afternoon, with no injuries reported, Japanese government sources said.

One of the two MV-22 Ospreys landed at Amami Airport in Kagoshima Prefecture at around 5:20 p.m., and the other one landed at the U.S. Kadena Air Base in Okinawa Prefecture about 30 minutes later. The two tilt-rotor aircraft had taken off from the respective airports, the sources said.

The incidents may add to safety concerns in Japan over the Osprey. The aircraft, which takes off and lands like a helicopter but cruises like a plane, has a record of accidents and mishaps inside and outside the country.

A CV-22 Osprey, the U.S. Air Force variant of the U.S. Marine Corps' MV-22, made an emergency landing in June at Amami Airport, and MV-22s belonging to the U.S. Marine Corps Air Station Futenma in Okinawa also made such landings in June last year and April this year.