Two girls were found dead on top of a New York City subway train Saturday morning, prompting a warning from the head of the transit agency about the hazards of "subway surfing” behavior.

The ages of the deceased girls found atop a Brooklyn-bound train was not confirmed Saturday, a spokesperson for the New York Police Department said.

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Demetrius Crichlow, the president of NYC Transit, called the deaths a tragedy and he highlighted the dangers of “subway surfing,” when people ride atop trains.

“It’s heartbreaking that two young girls are gone because they somehow thought riding outside a subway train was an acceptable game,” Crichlow said in a statement.

“Parents, teachers, and friends need to be clear with loved o

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