At least four people have been injured following an explosion near a U.S. military air base in Japan. Local and defense ministry officials said that four Japan Ground Self-Defense Force (SFD) members suffered slight injuries following the incident at Kadena Air Base in Okinawa on Monday.

An explosion at a storage site for unexploded ordnance at a U.S. military base on Japan’s southern island of Okinawa injured four Japanese soldiers, though the injuries are not life-threatening,

An explosion occurred at the northern section of a munitions storage area on Kadena Air Base, Okinawa, according to the Air Force.