New Yorkers on Instagram: "The unidentified attacker approached an 18-year-old male around 5:55 a.m. on a subway platform inside the Broadway Junction station. The attacker just stares into the teenager’s face without saying anything. The stranger then stabbed the victim in the back with a knife and, for good measure, also punched him in the left eye with brass knuckles. The assault left the victim with a laceration on his back and bruising and swelling on his face. The injured man went by private means to Kings County Hospital where he was in stable condition. The attacker fled onto a northbound A train and has yet to be caught by police. Anyone with information regarding this incident is asked to call the NYPD’s Crime Stoppers hotline at 1-800-577-TIPS (8477) #newyorkers"