While he was out of the bus , the bus rolled back and crashed into a Georgetown University building .
On April 18 , 2007 , a driver of a bus was off - duty and had left the bus to attend to other business .
While driver was out of the bus , the bus rolled back and crashed into a Georgetown University building .
On April 18 , 2007 , a driver of a bus was off - duty and had left the bus to attend to other business .