Staying safe in the subway

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NEW YORK (PIX11)-- A video of a woman being slapped by a man on the subway has been seen by hundreds of thousands of times, but it's not the first time violence broke out in transit with a camera ready to document the chaos.

Why are these incidents happening on subway? On which lines do they occur most? How, as a passenger, can you stay safe?

Vinnie Parco, a security expert and private investigator, answers those questions, above.