Riverside Mourns Officer Killed in “Cowardly Ambush”

Riverside Police Chief Sergio Diaz says two civilians came to the aid of a pair of officers attacked in an early morning shooting while on duty. Authorities suspect ex-LAPD Officer Christopher Dorner ambushed the pair while they were stopped at a traffic light. Michelle Valles reports from Riverside for the NBC4 News at 6 p.m. on Feb. 7, 2013.