Video from one of the incidents shows the suspect in a cab, pointing a firearm at the driver while demanding money.
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According to police, there were seven incidents total in Flatlands, Coney Island, East New York and Brownsville.
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The incidents took place between July 28 and August 5.
In each incident, the suspect runs off after the drivers comply and give him cash.
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None of the victims were injured as a result of the robberies.
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