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One video uploaded on Twitter showed a steady stream of people running away from a train car where, seconds later, a blaze lit up. Another video showed passengers rushing to squeeze out of the train’s windows and onto the platform where the train had made an emergency stop.

“I thought it was a Halloween stunt,” one witness told the Yomiuri newspaper, recalling the moment he saw other passengers running in a panic towards his train car. “Then, I saw a man walking this way, slowly waving a long knife.” There was blood on the knife, he said.

Another video on Twitter showed a bespectacled man dressed in a purple suit and bright green shirt, as worn by the Joker, seated in an empty train puffing on a cigarette, his legs crossed and looking calm. He can be seen through the window being surrounded by law enforcement in a subsequent clip.

Local media reported later that the suspect told authorities he “wanted to kill people so he could be sentenced to death.”

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The attack occurred on the Keio express line bound for Shinjuku, the world’s busiest rail station, at around 8 p.m. (1100 GMT), media said.

Partial service on the Keio line remained suspended late on Sunday, when Japanese voters went to the polls in a lower house election.