Investigators still have not found a motive for the Las Vegas shooting rampage that killed 58 people, Undersheriff Kevin McMahill has said.

Seattle Seahawks star Michael Bennett has claimed police threatened to shoot him last month in Las Vegas for "being a black man in the wrong place at the wrong time".

A man and a woman ambushed and murdered two police officers lunching at a Las Vegas restaurant at point-blank range before fleeing to a store where they killed a third person, then themselves, in an apparent suicide pact.