North Korea has stepped up efforts at home to prevent intelligence being leaked out to China following its nuclear weapons test, South Korea's Yonhap news agency reported Sunday.
The communist state made the move as it expected foreign countries to boost intelligence-gathering efforts after the North's Oct. 9 nuclear test, Yonhap said, citing an unidentified North Korea-watcher in the Chinese city of Shenyang.
North Korea's police headquarters issued an instruction on Oct. 15 to police around the nation to step up monitoring of those who have a record of unauthorized border crossings or trade with China and those who have relatives in China, Yonhap said.
The North has also increased the number of guards on its border with China to prevent defections, the report said.
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