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.

More than 40 years after one of the most notorious crimes of the US civil rights era – the “Freedom Summer” killings of three young civil rights workers - a reputed Ku Klux Klansman was arrested on murder charges in the case.