Unidentified person enters North Korea from South in rare border breach
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The person was detected by surveillance equipment in the Demilitarised Zone -- which divides the Korean peninsula -- at 9:20 pm local time on Saturday, South Korea's Joint Chiefs of Staff said Sunday.
It sparked a search operation by the military, but to no avail.
"It was confirmed the person crossed the Military Demarcation Line into the North," it added.
No unusual activity by the North Korean military has been detected, he said.
His crossing prompted North Korean officials to put the border city of Kaesong under lockdown over fears he may have the coronavirus.
The vast majority of North Korean who escape first go to China before making their way to the South, usually via another country.
Only a few have dared to cross the DMZ, which is riddled with landmines and has a heavy military presence on both sides.