A 24-year-old man wearing a Joker costume attacked passengers on a Tokyo train line on Sunday evening.
As many as 17 people were injured as they headed for Halloween parties in the city.
Witnesses say the suspect was wearing a green shirt and purple suit.
He sprayed a clear liquid around the carriage and set it alight. Video footage showed passengers running through carriages away from the flames while others clambered through windows.
“I thought it was a Halloween stunt,” one witness told the Yomiuri newspaper about the attack. “Then, I saw a man walking this way, slowly waving a long knife.”
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