A Brooklyn woman was harassed while taking the subway, by a disturbed man - who became upset when she refused to give him her phone number or her IG handle.

The man first approached his victim - as she sat waiting for the subway to take her to work on Thursday morning. The man asked for the pretty young woman's number - and when she politely refused him, things got ugly.

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But the woman kept calm, and pulled out her phone and started streaming the interaction on Instagram Live.

The deranged man lambasted the woman and then followed her onto the subway - where he continued the harass and threaten her. Luckily, people on the train came to her defense, and eventually the man left her alone.

MTO News learned that the New York police are looking for the man in the video, to question him about his menacing behavior.

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