NEW : China has seized the ship and its nine sailors . South Korea : The fishermen are suspected of fishing illegally in the Yellow Sea . Members of the Chinese coast guard board a Chinese ship to investigate . Competent authorities have taken measures to educate Chinese fishermen and management of outbound fishing boats to prohibit cross-border fishing and irregularities . nine person on board stabs two commandos , killing two , Ministry of Foreign Affairs says .
NEW : China has seized the ship and its nine sailors . South Korea : The fishermen are suspected of fishing illegally in the Yellow Sea . Members of the Chinese coast guard board a Chinese ship to investigate . nine person on board stabs two commandos , killing two , Ministry of Foreign Affairs says .