A saw-wielding assailant who injured members of Japanese girl group Akb48 in a terrifying slasher attack last May (14) has been jailed for six years.

Satoru Umeta, 24, attacked bandmembers Rina Kawaei and Anna Iriyama at a fan event in Japan with a saw fixed with box-cutter blades.

The women suffered broken bones in their hands and cuts to the arms and face, while a man who tried to protect the girls was also hurt in the attack.

Umeta pleaded guilty to charges stemming from the incident, and he was sentenced to six years in prison on Tuesday (10Feb15).

The judge overseeing the case called Umeta's actions "cruel" and insisted the victims were lucky to be alive.

The group cancelled a concert in the aftermath of the attack, but both singers have since returned to the line-up.