The 13 children are believed to be pupils of Caritas elementary school, a private Catholic school in Kawasaki, reported Japan Today quoting Kyodo.

The suspected, who is in his mid 40s or 50s, stabbed the victims and later stabbed himself, reports said.

The police told the newspaper the attacker later died in the hospital.

The incident appeared close to Noborito Station.

The motive behind the attack is still not known.

Security officials reached the spot after the incident.