NEW : North Korea has seized the ship and its nine sailors . South Korea : The sailors are suspected of fishing illegally in the Yellow Sea . Members of the South Korean coast guard board a Chinese ship to investigate . The South Korean coast guard has stopped hundreds of Chinese boats this year on suspicion of illegal fishing in the sea . One sailor on board stabs the fishermen , killing one , the coast guard says .
NEW : North Korea has seized the ship and its nine sailors . South Korea : The sailors are suspected of fishing illegally in the Yellow Sea . Members of the South Korean coast guard board a Chinese ship to investigate . One sailor on board stabs the fishermen , killing one , the coast guard says .