North Korea remains unresponsive after South Korea sent a message about an unidentified person having crossed the eastern inter-Korean border over the weekend, Seoul's Defence Ministry said on Monday.
On Sunday, South Korea sent the message through a western military communication line "in light of protecting our citizen", though it has yet to verify details about the person who crossed the heavily fortified border on Saturday night, reports Yonhap News Agency.
The fate of the person was not immediately confirmed amid reports the North has a "shoot-to-kill" policy in place as part of tougher border control measures against Covid-19.
"We have sent the message in light of protecting our national, and we have not received a reply from North Korea yet," Boo Seung-chan, the Ministry spokesperson, told a press briefing.
South Korea's military is trying to verify whether the person in question is a South Korean citizen or a North Korean defector.
Also unknown is whether the person is a civilian or a military personnel.
"We are currently in the process of identifying the unknown person under cooperation with related authorities," Col. Kim Jun-rak, the spokesperson of the Joint Chiefs of Staff, also told reporters.
Kim added no unusual North Korean military movements have been detected.
The latest incident has called into doubt South Korea's front-line defence despite its military's earlier pledge to bolster defence with high-tech surveillance system.
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