LAS VEGAS, Nev. -- One man was killed and another person escaped injury in an explosion of a small device left atop a vehicle outside a Las Vegas Strip resort.

Police said the blast was not a terrorist act, but an apparent slaying with an unusual murder weapon. The victim and a co-worker who was nearby were employees at the Luxor hotel-casino.

The man was fatally hurt when the device exploded as he removed it from atop a car a little after 4 a.m. on the second floor of the parking structure behind the Luxor. Police said initial reports that it was a backpack were wrong.

There's not much damage around the vehicle, and the hotel and casino were not evacuated. The Luxor's a pyramid-shaped hotel at the south end of the Las Vegas Strip. It's owned by casino giant MGM Mirage, which is not confirming that the man who was killed was an employee.

Federal Bureau of Alcohol, Tobacco, Firearms and Explosives agents are involved in the investigation.