An Air Force Office of Special Investigations agent was found dead Monday in his home outside Misawa Air Base in northern Japan, the base public affairs office said.

Mashkhur Mukhamadiev, 25, appeared to have suffered a gunshot wound, and a gun was found at the home, though the exact cause of his death was still under investigation on Tuesday, according to the Air Force and the local Japanese police. The air base said there did not appear to be any criminal or suspicious activity at the home.

The gun is believed to be Mukhamadiev’s service weapon, the Air Force said. As an OSI agent, he was among a limited number of federal agents permitted to carry a gun off base in Japan.

“Misawa Air Base is saddened by the death of Agent Mukhamadiev,” Col. Michael Rothstein, the 35th Fighter Wing commander, said in a released statement. “Our prayers are with him and everyone affected by this incident.”