A South Korean soldier shot and killed five fellow soldiers and wounded five others at a border post near North Korea on Saturday night, reports Associated Press.

The conscript army sergeant opened fire near Goseong, Gangwon Province, and then fled with the rifle and ammunition, Yonhap News reports. A spokesman for South Korea’s Defense Ministry would not confirm that the soldier was still at large, but Yonhap says there was an operation to capture the missing soldier late Saturday night.

The soldier, identified as having the surname Lim, was a part of the 22nd Infantry Division.

South Korean officials do not suspect North Korean involvement.