Transcript for Megabus Crashes Into Illinois Highway Overpass
with breaking news on an illinois highway tonight. Looka the pictures just coming in. A double-decker bus careening out of control, slamming into a pillar supporting the bridge. The front of the bus collapsing like an accordion. Ambulances and helicopters rushing to the scene and lisa stark leads us off. Reporter: It was a violent crash. The mega bus traveling at highway speeds rammed into the concrete pillar of an overpass. Investigators say it may have been a blown tire, causing the driver to lose control. There were more than 60 passengers on board. At least one died. Rescuers had to use ladders to reach those on the upper deck. Dozens of ambulances and life flight helicopters raced the injured, at least 25 people, to local hospitals, some critically hurt. The bus was traveling interstate 55 from chicago to st. Louis, and scheduled to continue on to kansas city. Mega bus is the largest curb side bus operator in the u.S. And offering internet fares as low as a dollar. In sept of 2010, four passengers died after the driver missed an exit and crashed the company says it has the highest sy rating from the federal government but there's increasing concern overall. Their cheap fares are attracting hoards of riders. Passenger traffic jumped 30% last year alone. The fatal accident rate for curbside buses, seven tim that of greyhound, according to the ntsb. In may, the department of transportation launched surprise inspections. 26 bus companies shut down. But as today's accident makes clear, safety concerns continue. Mega bus tells abc news that it has a detailed safety and training program in place and the company says it working with investigators to try to figure out what went wrong.
This transcript has been automatically generated and may not be 100% accurate.