Two police offers were shot in a pizza restaurant in Las Vegas during a shooting spree that left at least three dead.
According to the Associated Press news agency, police said two suspects shot two officers who were eating lunch, with one shouting: "This is a revolution."
They were then said to have fled to Walmart across the street, where they shot a person before killing themselves.
The condition of the officers is not immediately known, the police spokesman said.
More top news
ITV News political correspondent examines the reaction to Labour's Pledge Stone.
The high-profile couple blamed their schedules and not being able to spend time together on their mutual decision to end their relationship.
Fans, politicians and celebs have joined in May the 4th be with you craze trending on twitter on 'Star Wars Day'.