China's state media say authorities in Heilongjiang Province have found 25 bombs they believe Japanese troops abandoned during World War Two. Xinhua news agency says a policeman saw a student playing with a rusted bomb in front of other children at a middle school. After confiscating it, the policeman said the aging weapon still had powder and a fuse that could make it explode.

Xinhua says the student's father found the bomb in a pond Wednesday. Police then found four other bombs at the man's home and 20 more in the pond.

According to an international weapons convention signed in 1997, Japan is obliged to provide funds, equipment and personnel to remove and destroy all weapons it left in China.