Police are investigating possible connections between white supremacy and a shooting that resulted in the death of two Las Vegas police officers and a civilian, the Las Vegas Review-Journal reported on Monday.

The report stated that police found swastikas and other paraphernalia that may link the couple who perpetrated the murders to white supremacy and “militant” activities.

Neighbors were quoted as saying that the man and woman in their 20s often spoke of conspiracies, white supremacy and “killing cops” while appearing to be militant.

Others told police that they suspected the two were methamphetamine users.

The shooting took place on Sunday when the couple, dressed in camouflage, approached a pizza parlor where the two policemen, officers Alyn Beck, 41, and Igor Soldo, 31, were having lunch.

Witnesses state they heard the shooters shouting, “This is a revolution!” before killing the two officers, one of which was able to return fire before being shot.

They then covered the officers with a cloth that featured the Gadsden flag, a yellow banner with a coiled snake above the words, “Don’t tread on me.”

The revolutionary era flag has recently come back in vogue as an adopted symbol of the American Tea Party movement.

The couple retreated to a Walmart store nearby where they killed a woman bystander, before the female shooter killed her partner and then herself in a suicide pact.

Unconfirmed witness accounts said that a shopper at Walmart carrying a concealed weapon fired at the shooters before they dispatched themselves.