Canada ? Passengers aboard a Canadian bus fled in horror as a fellow traveler viciously attacked his seat mate, repeatedly stabbing him and then severing his head, witnesses said Thursday.

Police said a 40-year-old man was arrested after the grisly attack late Wednesday night aboard a Greyhound bus en route from Edmonton, Alberta, to Winnipeg, Manitoba.

The suspect was captured as he tried to escape from the bus early Thursday about three hours after the violence, Royal Canadian Mounted Police Sgt. Steve Colwell told reporters.

Authorities declined to provide details beyond that the victim had been stabbed. They said a motive hadn’t been determined and refused to identify the suspect or the victim.