No drugs, alcohol in driver in deadly Tennessee school bus crash

Johnthony Walker, 24, was driving the bus full of students home from Chattanooga's Woodmore Elementary School on Monday when it veered off a road, flipped onto its side and smashed into a tree and telephone poll, according to a police affidavit. Walker was driving on a narrow, winding road at well above the speed limit of 30 miles per hour (48 km per hour) when he lost control, leaving the bright yellow bus mangled and nearly severed in two, the affidavit said. National Transportation Safety Board Chairman Christopher Hart on Wednesday told reporters there have been no fatal crashes on the stretch of road over the past three years.