A 27-year-old Japanese man has been arrested for planning a class reunion massacre of some former schoolmates who had bullied him in junior high school, police said Wednesday.

Three officers were wounded by homemade explosives after police, tipped off by Ryoji Akashi's mother, tried to foil his vendetta.Police uncovered Akashi's motive in a diary entry in his word processor. "At the reunion party, I plan to revenge the bullying I received at junior high school. I will kill them with bombs and poison," it said.