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At least ten people were reportedly injured after a fire started on a Tokyo train on Sunday. Following the incident, a man with a knife was arrested.

京王線火災で逃げる人々 pic.twitter.com/ZfN1pD0C2V

The suspect doused parts of the train car with an unspecified liquid and set it on fire at around 8pm local time on Sunday, according to Japanese state-owned news organization NHK citing witnesses.

The incident took place in the Tokyo prefecture of Chofu on a moving train, which was headed to the world’s busiest train station, Shinjuku, on the Keio train line. The suspect is believed to be in his 20s.

Police were reported to be investigating whether hydrochloric acid was also used in the incident, however police later denied any spread of acid on the train.

京王線社内で火災発生 pic.twitter.com/94cLtJkDy4

The incident took place just two weeks after a 45-year-old man was arrested for stabbing two men at Tokyo’s Ueno Station. Both victims were hospitalized and the suspect – who was reportedly “rambling incoherently” and carrying a bloody knife – was soon apprehended by police.