A North Korean naval patrol boat briefly crossed the disputed Yellow Sea border with South Korea on Thursday while tracking Chinese fishing vessels, military officials in Seoul said.
The apparently accidental incursion, which the officials said lasted only seven minutes, came amid heightened tensions on the Korean peninsula ahead of the South's presidential election in December.
The patrol boat sailed about 36 metres (120 feet) into the southern side of the sea boundary but swiftly retreated after a warning radioed by South Korean naval ships, the South's Joint Chiefs of Staff (JCS) said.
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