A married couple yelling "revolution" gunned down two Las Vegas police officers at a pizza restaurant, then ran across the parking lot to a Walmart, where they killed a shopper at the store's entrance, CNN reports.
The duo's Sunday morning shooting rampage ended when the wife fatally shot the husband and then herself as police closed in.
A day later, police don't know -- or haven't disclosed -- the pair's motive. Witnesses told police the shooters said "This is a revolution" during their attack.
A law enforcement source told CNN the couple held extremist views toward law enforcement.
See this story on www.cnn.com