15 injured in a knife-and-fire attack in Tokyo train
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A video clip published by public broadcaster NHK showed panicked passengers running down the train as smoke filled the carriage, with flames also visible.
Another video posted on Twitter showed people climbing through windows to escape the Keio Line train at a station.
The line operator said services had been partially suspended after "an incident involving injuries" took place just before 8 pm near Kokuryo in the Japanese capital's western suburbs.
Media outlets including NHK said the alleged perpetrator in his 20s attacked people with a knife and started a fire on the train. The method was unclear but reports also said the man had spread a liquid around the train carriage.
Kyodo News said 15 people had been injured in the attack, with NHK reporting at least 10 were hurt with a man in his 60s in serious condition.
"First I thought it was something like a Halloween event. But I rushed away as a man carrying a long knife came in. I was very fortunate not to be injured," a man in his 20s who was on the train told NHK.
Local police officials could not immediately be reached for comment. Violent crime is rare in Japan, but in August nine people were wounded, one of them seriously, in a stabbing attack on a commuter train in Tokyo, with the suspect later handing himself in after fleeing the scene.
In 2019, a man killed two people including a schoolgirl and wounded more than a dozen in a rampage that targeted children as they waited for a bus. And in 2018, a man was arrested in central Japan after stabbing one person to death and injuring two others aboard a bullet train.