10 people injured

Knife-wielding man injures 10 on Tokyo train

The suspect, 36, allegedly told police he became angry when he saw women who "looked happy" and wanted to kill them, according to local media reports.

One victim, a female student, is said to be seriously injured, while the others suffered less severe injuries.

Violent crime is rare in Japan and tight security measures are in place in Tokyo, which is hosting the Olympics.

The man attacked passengers on a train near Seijogakuen station at about 20:40 (11:40 BST) on Friday.