The allegedly pistol-packing teen ... a loaded gun inside a backpack, prompting NYPD cops to respond shortly after 12:50 p.m., according to police. A 16-year-old boy toted a loaded gun to school ...

Officers said the teen boy was last seen around 7:30 a.m. on that day carrying a black duffle bag and backpack. Ahad, who stands 6-foot-1 and weighs around 130 pounds, has black hair and brown eyes.