A teen was stabbed on a subway platform in Brooklyn while trying to stop a man from stealing his backpack. Police say the 17-year-old was on the southbound 3 train platform Friday just after 9:00pm at the Utica Avenue and Eastern Parkway stop when the man grabbed his backpack. The teen says when he tried to get the bag back, the man knifed him in the shoulder. Click here to read more on abc7ny.