Chilling video footage captured the moment a deranged teenage gunman racks a round into the chamber of a 9mm handgun before running up to an NYPD vehicle and opening fire — leaving a veteran detective shot in the back.
The 18-year-old shooter is seen flashing the weapon as he walks back and forth on Nostrand Avenue in Crown Heights around 4:45 a.m. Sunday, just a half block from an unmarked police cruiser, surveillance video obtained by The Post shows.
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