South Korea 's military said on Wednesday that it had detained a North Korean soldier overnight after he crossed near the central section of the inter-Korean border.  "The military secured one North Korean soldier in the central front Tuesday night and relevant authorities are currently investigating the details," Seoul's Joint Chiefs of Staff said in a message to the media, including Yonhap.  South Korean news agency Yonhap also reported, without citing a source, that the soldier was believed