A new state police report confirms that a blown tire led to that fatal Megabus crash downstate earlier this month.
Gov. Pat Quinn is calling for a federal investigation of Chicago-based Megabus.
Megabuses were running as usual Friday morning, a day after a packed double-decker bus from Chicago crashed into a bridge downstate and left a woman dead.
One person was killed and dozens of others were injured when a double-decker Megabus headed from Chicago to Missouri crashed into a concrete bridge support in southern Illinois.
A school bus carrying 6th-grade students from Highland has collided with a tractor trailer near the southern Illinois community of Litchfield.