A teacher at a Knoxville, Tennessee elementary school is accused of shooting and wounding two principals Wednesday. Mark Stephen Foster, a 48-year-old fourth grade teacher, was charged by police with two counts of attempted first-degree murder. One principal is in critical condition and another stable condition at a local hospital. Students had been dismissed only an hour earlier due to snow. A school spokesman told the Associated Press that the school had not planned on rehiring Foster next year. A year earlier, Foster's brother attempted to get a restraining order against him, alleging mental illness.