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The teenagers, found unconscious on the roof of a train in Brooklyn, appear to be the latest casualties of a popular and deadly game.

By Maia Coleman

Two teenage girls were discovered dead on top of an incoming J train at a Brooklyn subway station early Saturday and appeared to have been subway surfing, the deadly, social-media-fueled trend popular among some New York City youth, the authorities said.

Officers responding to a 911 call found the girls unconscious shortly after 3 a.m. on the roof of the last car of a train at the Marcy Avenue station in Williamsburg that had just crossed the Williamsburg Bridge from Manhattan. They were pronounced dead at the scene. Their names and ages have not been released.