A stabbing attack on a train in Tokyo left four people injured.

Japanese media reports that a knife-wielding man has been arrested after four people were injured on the Yamanote Line train when it stopped at the city’s Akihabara station.

Video shared on social media shows police officers arresting a suspect who has been pinned down on the floor of the train. Initial reports indicate that the suspect was a woman.

Japanese media NHK broadcast the incident shortly before midnight local time.