Authorities say a shooting at a Phoenix motel has left three people with critical wounds.

Fire Department Capt. Ardell Deliz says the men in their 30s and 40s were rushed to a hospital following the shooting late Sunday night.

Deliz says two other people were treated at the scene for apparent graze wounds, but they refused hospital care.

There was no immediate word on what touched off the gunfire at the Interstate 17-area motel in north Phoenix.

There was also no indication of any suspects or arrests.

Police spokesman James R. Holmes indicated in a statement that an investigation was underway, but didn't elaborate.