At least 17 people were injured earlier today on a Tokyo commuter train after a passenger dressed as the “Joker” went on a stabbing spree:

The 24-year-old man also attempted to set fire to one of the cars before being arrested:

Witnesses told the media they thought it was a Halloween prank:

Video shows some of the passengers escaping through the train’s windows:

There are also *unconfirmed* reports that he also sprayed passengers with an acid of some sort:

We’ll keep you posted.

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