A man in Tokyo dressed as the Joker stabbed passengers aboard a train line, injuring 17 people on their way to Halloween parties in Shinjuku.

The train made an emergency stop around 8 p.m. Sunday night after the 24-year-old man also set a small fire on the train. Police arrested the suspect on the spot and suspended service while they conducted an investigation.

Three people were severely injured, including a man in his 60s who remains in crucial condition, The Daily Mail reported.

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The suspect wore glasses and a green shirt, but otherwise dressed in the Joker’s signature purple suit. A video posted to social media showed the man sitting alone in a train car, legs crossed, and smoking a cigarette.

Some witnesses thought that the man was part of some Halloween stunt until people started running and the suspect started waving a “long knife” with blood on its blade.

Another video posted to Twitter showed passengers fleeing through the train and gathering as far from the attack as possible.

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Witnesses also reported the suspect had spread fluid and started a fire, according to Reuters.

The Keio express train made an emergency stop due to the fire.

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The suspect reportedly told authorities he “wanted to kill people so he could be sentenced to death.”

Service to the Keio line remained suspended throughout the night.