Teen stabbed boys at sleepover because of 'religious beliefs': police

A Florida teenager — who had previously been investigated for “alleged violent tendencies” — watched jihadist videos and read the Koran “to give him courage” before stabbing a 13-year-old boy to death and seriously injuring two others at a birthday sleepover Monday, cops said. Corey Johnson, 17, was charged with first-degree murder and attempted first-degree...