PORTAGE LA PRAIRIE, Manitoba (AP):

A man aboard a Greyhound bus stabbed a fellow passenger, Canadian police said yesterday, and witnesses said the victim was decapitated.

The Royal Canadian Mounted Police said in a statement that a man was arrested for the homicide which occurred late Wednesday night aboard the bus, which was en route from Edmonton, Alberta, to Winnipeg, Manitoba.

Authorities declined to name the attacker or victim, and provided no other details about the attack.

Stabbed repeatedly

Passenger Garnet Caton said the victim was stabbed 40 or 50 times by the man sitting next to him. The passenger then allegedly severed the man's head with a large knife and held it up by the door for others to see.

"We heard this bloodcurdling scream and turned around, and the guy was standing up, stabbing this guy repeatedly, like 40 or 50 times," Caton said from a hotel in Brandon, Manitoba, where he and other passengers had been taken to rest.

Caton said the bus stopped and the passengers scrambled to disembark while the suspect allegedly began methodically carving up the man's body.

"When he was attacking him, he was calm ... like he was at the beach," Caton said. "There was no rage or, or anything. He was just like a robot stabbing the guy."

Caged murderer

Caton said he, the bus driver and a trucker at the scene reboarded to see what was happening.

He saw the suspect had the victim on the floor of the bus and "was cutting his head off and pretty much gutting him."

He said they quickly dis-embarked and braced themselves against the door to prevent the attacker from leaving, while they waited for police to arrive.