An unidentified North Korean man crossed the heavily fortified land border separating the two Koreas and is in South Korean custody, the South’s military said Friday. The South’s Joint Chiefs of Staff said the military identified and tracked the individual near the central-west section of the military demarcation line and conducted a “guiding operation” before taking the person into custody Thursday night.

In April, South Korean troops fired warning shots to repel about 10 North Korean soldiers who briefly crossed the military demarcation line. The South’s military said the soldiers returned to North Korean territory without incident and that the North didn’t return fire.