TOKYO (AP) _ Japan's nuclear safety agency says it suspects an explosion at a nuclear power plant may have damaged a reactor's container and fears a radiation leak.

   An agency spokesman, Shigekazu Omukai, says the nuclear core of Unit 2 of the Fukushima Dai-ichi plant was not damaged in the explosion early Tuesday.

   But the agency says it suspects the bottom of the container that surrounds the generator's nuclear core might have been damaged.

   Another agency spokesman, Shinji Kinjo, says that ``a leak of nuclear material is feared.''