The government is considering legislative amendments to cope with any future intruding vessels, Prime Minister Keizo Obuchi told a Diet committee Friday.

On Tuesday, two unidentified ships reported in Japanese territorial waters escaped pursuit by the Maritime Safety Agency and the Maritime Self-Defense Force and fled into a North Korean port Wednesday.

Speaking at the Special Committee on Guidelines for Japan-U.S. Defense Cooperation in the Lower House, Obuchi said similar incidents may occur in the future and the government must learn a lesson from the intrusion.