FORT LAUDERDALE, Fla. — Police officers pulled over a 19-year-old recent graduate from Okeechobee High School because the headlight on his truck was out. Then they found handwritten pages detailing plans to kill everyone at his high school. Henry Horton IV, of Okeechobee, was arrested Thursday by Palm Beach County Sheriff’s detectives after they uncovered his plans for mass killings at .
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