The attacker, whom police identified as 24-year-old Kyota Hattori, was arrested on the spot after Sunday's attack and was being investigated on suspicion of attempted murder.

A man carrying a knife in each hand and screaming “I will kill you!” attacked a group of schoolgirls and adults as he walked toward a school bus parked at a bus stop just outside Tokyo, Japan on Tuesday, killing two and injuring 16 before killing himself, officials said.

It wasn't immediately clear how serious the other injuries are.