The Massachusetts man charged with conspiring in a terror plot has been a middle school math and religion teacher at a Muslim school in Worcester. Colleagues at the Alhuda Academy say they cannot believe the allegations against Tarek Mehanna (TEH'-rek meh-HAH'-nah), who was arrested Wednesday and charged in conspiring to support terrorism. They say he was a sweet guy and loved by his students. But prosecutors say Mehanna and his associates sought training at terrorist camps and discussed plans to target U.S. troops in Iraq and two politicians and to randomly shoot shoppers at U.S. malls.