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(CNN) - A Las Vegas couple who gunned down two police officers and a civilian before killing themselves apparently looked at law enforcement as oppressors, a sheriff's department official said Monday.
Among the clues: a "Don't Tread on Me" flag and a Nazi swastika the couple placed on one of the police officers they ambushed Sunday at a pizza restaurant. They pinned onto the other officer's body a note saying something to the effect of "this is the beginning of the revolution," Second Assistant Sheriff Kevin McMahill told reporters.