LAS VEGAS, NV (CBS) -- Two police officers, and three others are dead after a shooting in Las Vegas.
Two of the dead are responsible for the shooting, police say.
They say the couple opened fire in Las Vegas then turned their weapons on themselves.
Police officers comforted each other after a man and woman shot and killed two of their own in a Las Vegas pizza parlor just before noon Sunday.
The officers were eating lunch at the time.
A witness says the couple told him they planned more bloodshed. "They had a backpack, and I saw their gun in their hand, and he just told me to tell the cops that this is a revolution and they had killed two cops inside CiCi's," Witness Alvaro Lopez says.
Police say the couple went into a nearby Walmart where they killed one more person.
Swat officers quickly surrounded the store.
The couple then turned their guns on themselves.
Police have not yet established a motive for the killings.
Las Vegas officials say they're doubling up officers in patrol cars until investigators can determine if this was an isolated act.