The driver of a Greyhound bus is listed in stable condition in hospital after his throat was slashed by a passenger, causing the bus to roll over. At least six people on the bus died in the crash near Nashville, Tenn.

The incident triggered the suspension of a Greyhound service across North America for several hours Wednesday, but after investigators determined there was no link to the Sept. 11 terrorist attacks, buses began rolling again.

"Our operations are safe and are now up and running," Craig Lentzsch, president of Greyhound, told the media at a news conference.

The bus, carrying 36 people, crashed at 4 a.m. ET, on the outskirts of Manchester, a city halfway between Nashville and Chattanooga.

Reports said the suspect was acting strangely in the minutes leading up to the attack. He reportedly asked a question about the bus' route, then asked a woman in the front row for her seat. When she refused, he lunged at the driver with a razor blade or box cutter.

Dr. Ralph Bard, who performed the surgery on the driver said he was told the suspect boarded the bus in Louisville, Kentucky, but "never acted threatening until the actual attack."

The passenger who attacked the driver died in the crash. Justice Department officials said he was carrying a Croatian passport.

Lentzsch said passengers who don't want to use their Greyhound tickets following the incident can exchange them for free for Amtrak train tickets, or opt to receive a full refund.

Nervous commuters

The suspension of Greyhound service coast-to-coast forced thousands of commuters to find an alternative means of transportation. Many commuters say they're increasingly nervous about public transporation.

"I'm scared and worried because I'm now trying to figure out again which way is the best to travel," said George Garecht, 30, who was stranded at the Atlanta bus terminal.

Masa Yoshima of Osaka, Japan said the tragedy wouldn't deter him from continuing his tour of the U.S. "I will have to take out my city map and see some more sites in Miami," said Yoshima.