Two police officers and a third person were killed by two gunmen in Las Vegas on Sunday, according to Las Vegas Metropolitan Police spokeswoman Laura Meltzer.
The attackers first opened fire and killed the officers at about 11:30 a.m. as they were eating lunch, she said.
Witnesses told police that the gunmen said "this is a revolution."
The shooters then crossed a street and went to a Walmart where the third person was killed at the store's entrance, Meltzer said.
The suspects then killed themselves, she said.
Walmart spokeswoman Brooke Buchanan released a statement: "We express our deepest condolences to everyone who have been affected by this senseless act of violence."
The store is closed, and the company is working with investigators, the statement said.