A South Korean naval ship fired warning shots Thursday and seized a North Korean fishing boat intruding across the disputed Yellow Sea border

A South Korean naval ship fired warning shots Thursday and seized a North Korean fishing boat intruding across the disputed Yellow Sea border, military officials said.
  
The vessel sailed a nautical mile south of the sea boundary at 5:26 pm (0826 GMT), prompting a South Korean patrol ship to take action, the South's defense ministry said. "Our side fired warning shots as the North Korean vessel ignored repeated warnings to retreat," a ministry spokesman told AFP.
  
The vessel with three people aboard was captured about two hours later as it failed to sail back into northern waters probably due to foggy weather and strong currents, he said.
  
The vessel's crew will be investigated to see whether the incursion was accidental, he said. The spokesman said a tough response from South Korea was inevitable given the high tensions along the disputed sea boundary. The South Korean naval ship radioed a message to a North Korea military vessel staying near the sea boundary that the seizure was aimed at ensuring the safety of the crew, he said.