3 / 6

Emergency responders works the scene of bush crash on the George Bush Turnpike Thursday, April 11, 2013, in Irving, Texas. The chartered bus overturned on the busy highway near Dallas killing at least two people and injuring several others, authorities said. (AP Photo/LM Otero)

Emergency responders works the scene of bush crash on the George Bush Turnpike Thursday, April 11, 2013, in Irving, Texas. The chartered bus overturned on the busy highway near Dallas killing at least two people and injuring several others, authorities said. (AP Photo/LM Otero)