CHICAGO — Chicago police officers may have stopped a tragedy from unfolding at a Northwest Side high school on Friday afternoon: A troubled student who threatened to shoot up the school as he left campus was arrested by cops who allegedly saw him ditch a loaded firearm directly outside the school grounds.
At about 1:50 p.m., officials at Foreman College and Career Academy, 3235 North Leclaire, notified police that a 17-year-old student had left in an Uber, saying he was going to come back with an AR-15 to shoot up the school, according to initial information given to responding officers.
Cops in a nearby police district went to the boy’s home while other officers responded to the school…