While their classmates were playing ball, learning to drive or working at part-time jobs this summer, three students at Lakeshore High School near Mandeville spent the past several weeks plotting a shooting spree for the first day of school next week that would have targeted at least one student and a faculty member, authorities said Friday.The plan, which the boys planned to conclude with their own suicides, was sniffed out and foiled by St. Tammany Parish sheriff's deputies and school officials. The three teens who called their group "Day Zero" then were arrested and booked with conspiracy to commit terrorism.The...