At least 2 hurt, including cop in serious condition as active shooter reported at Park Ave skyscraper housing Blackstone, NFL headquarters

A crazed gunman wearing a bulletproof vest and carrying an assault rifle opened fire inside a swanky Midtown skyscraper that houses the Blackstone and NFL Monday — leaving one cop in serious condition during a shootout, sources said. The man entered the building armed with a rifle, law enforcement sources told The Post. NYPD responding...