Investigative sources say a suspect held in a stabbing at a Tokyo subway station remained inside the ticket gates for about 30 minutes before Wednesday's attack.



Tokyo police say 43-year-old Toda Yoshitaka is suspected of assaulting a university student with a knife while he was waiting for a train on a platform.



The incident occurred just before 7 p.m. at Todaimae Station on the Tokyo Metro Namboku Line.



The student fled onto a train. A security camera recorded the suspect chasing the student and slashing him multiple times.



The sources say there was no contact between Toda and the student before the attack.
Security camera footage shows the suspect entering a toilet and sitting on a bench during the 30 minutes at the station.



Police say it also appears that the two men were strangers.



One of the train passengers who intervened to restrain the suspect also sustained hand injuries.



Police arrested Toda on the spot on suspicion of attempted murder. They are continuing to investigate his motive, but say the suspect is refusing to answer questions.