The department responded to a call at 8:38 p.m. and found victims with bloodstains upon arrival at the scene. All of the victims were conscious and one person left on their own, the department said. No deaths have been reported.
According to the Japanese public broadcaster NHK, the suspect went to a nearby convenience store and surrendered saying to the clerk, “I’m the crime suspect that’s currently making the headlines. I’m sick of running. ”
NHK reported that the suspect appeared to be in his 30s and the store clerk said he had blood stains on part of his body.
The incident occurred on a train on the Odakyu Line, between Seijogakuen-mae Station and Soshigaya-Okura Station in the Setagaya district, Reuters reported.
Video recorded and posted to social media by one of the passengers shows medical workers on the train putting on plastic gloves.
Violent crime is rare in Japan, but there has been a series of violent knife attacks by assailants unknown to the victims.
In June 2008, a man in a light truck ran into a crowd in the popular district of Akihabara, then jumped out of the vehicle and started stabbing pedestrians, killing seven people.
Clarification: This article has been updated to reflect that NHK is the public broadcaster for Japan.