Security became a concern following the September 11 attacks . Less than a month later , on October 3 , 2001 , Damir Igric , a passenger on a Greyhound bus , slit the throat of the driver , killing Igric , and six other passengers as the bus crashed . It was determined there was no connection between the September 11 attacks and this incident . Nevertheless , this raised concern
September 11 attacks
September 11 attacks
Intercity bus service