The man who allegedly attacked and injured at least nine people on a commuter train in Tokyo on Friday, 6 August, reportedly told the police that he felt enraged on seeing women who looked happy and wanted to kill them, reported Reuters quoting the local media.
"I began feeling like I wanted to kill women who looked happy about six years ago. Anyone was fine, I just wanted to kill a lot of people," the suspect reportedly said.
As per news agency AFP, the man had initially fled the scene but later turned himself in at a convenience store where he told the manager that he was the perpetrator of the attack.
The incident took place in the Setagaya ward on an evening train. A woman in her 20s has reportedly sustained serious back injuries, while the rest suffered less severe injuries.
The rail operator was alerted after the attack, bringing the train to a halt. A phone and a knife believed to be that of the attacker were found onboard.
Japan, which is currently hosting the Olympic games, has strict gun laws. However, violent crimes involving other weapons are occasionally reported in the country.
This incident in Tokyo happened several kilometres from the venue of the Olympic games.
(With inputs from Reuters and AFP)