New York City police have released new video of a bizarre attack in the middle of a busy sidewalk.

Surveillance tape from inside a restaurant facing the street shows a sewer grate open up and a man pop out.

The man, described as 20 with wavy blond hair, is seen throwing what authorities say is a smoke bomb before he scurries back into the sewer.

Video shows a seating area fill with smoke.

Everyone is believed to be OK.

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