Federal authorities say a U.S. airman with ties to the "boogaloo" right-wing extremist movement killed a federal security officer outside a federal courthouse near San Francisco. Air Force Staff Sgt.

A United States Air Force sergeant arrested in the fatal ambush of a Santa Cruz County deputy earlier this month has also been charged with gunning down a federal security officer amid protests over ...

OAKLAND, Calif. — In the weeks before a gunman allegedly killed two officers in separate shootings last year in California, prosecutors say he and other members of an extremist militia known as the ...