CHATTANOOGA, Tenn. (AP) — The driver in a Tennessee school bus crash that killed six elementary school students took a cell phone call at the time of the crash, a prosecutor said Tuesday. According to the Chattanooga Times Free Press, Hamilton County District Attorney General Neal Pinkston said in court that Johnthony Walker received a call at 3:17 p.m. that day that lasted nearly four minutes. Pinkston said the first 911 call about the crash came in at 3:20 p.m. Authorities said Walker was speeding in November 2016 when he wrecked the bus on a curvy road in Chattanooga while carrying 37 children.