The incident passed off, authorities say, at round 8 p.m. (7 a.m. ET) on a train on the Keio railway line, NHK reported.
The train was working close to Kokuryo Station, within the metropolis of Chofu, west of Tokyo.
The suspect was additionally reported to have scattered liquid within the train automobile, which he then set ablaze.
At least eight individuals had been injured, NHK reported citing police. One of the victims, a person in his 60s, is severely injured and unconscious, the broadcaster added.
Police mentioned a person in his 20s, carrying a knife, has been taken into custody, in accordance to NHK.
The train operator mentioned in a tweet that the train's operation has been stopped due to the incident.
While violent crime is uncommon in Japan, there was a spate of violent knife assaults by assailants unknown to the victims.
In August, 10 passengers on a train in Tokyo had been stabbed by a person with a knife, in accordance to the Tokyo Fire Department. The suspect later turned himself in at a comfort retailer, NHK reported at the time. Tokyo Metropolitan Police mentioned the person confessed that he "just wanted to kill any women who looked happy, anyone," NHK reported.
In 2019, two individuals, together with a 11-yr-previous woman, had been killed and 17 different youngsters injured in a stabbing spree within the metropolis of Kawasaki, about 13 miles (21 kilometers) from Tokyo. In 2016, 19 individuals had been killed in an assault at a care house for disabled individuals -- the deadliest mass killing in Japan for the reason that finish of World War II.
And in June 2008, a person in a light-weight truck drove right into a crowd in Tokyo's widespread Akihabara district after which jumped out of the automobile and began stabbing pedestrians, killing seven individuals.
Japan -- a rustic thought-about one of many most secure on the planet -- strictly regulates weapons. It's unlawful for individuals to carry a pocket knife, craft knife, looking knife or field cutter in public, in accordance to the US State Department.
CNN's Yoko Wakatsuki and Miki Lendon contributed reporting.
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