The man alleged to have wounded 10 people in a knife attack on a Tokyo commuter train late on Friday told police he became incensed when he saw women who "looked happy" and wanted to kill them, Japanese media reported on Saturday.

Police arrested the 36-year-old man in another part of Tokyo after he slashed and stabbed people in the attack at about 8:40pm (7.40pm Malaysian time) on Friday on a train on the Odakyu Line in the western part of the city, media reported.