A gunman has opened fire on sheriff's deputies responding to a report of a domestic disturbance near Denver, Colorado, killing one officer.
The suspect was shot and apparently killed, the Douglas County Sheriff's Office says.
Four other deputies and two civilians were shot and injured by the suspect, who was "no longer a threat", the sheriff's office said on its Twitter account, following the incident on Sunday.
The deputies responded to a call of shots fired at the Copper Canyon Apartment Homes in Douglas County, about 26km south of Denver, around 6am (local time), said Jason Blanchard, a spokesman for the sheriff's office.
Littleton Adventist Hospital was treating three victims, according to Alyssa Parker, a hospital spokeswoman, who declined to describe their conditions.
Deputy Sheriff Zackari Parrish was pronounced dead at the hospital, where other law enforcement soon after formed a large memorial procession heading to the county coroner's office.
US President Donald Trump offered his condolences to the shooting victims.
"We love our police and law enforcement - God Bless them all!" Mr Trump tweeted.
Sky Ridge Medical Centre in Lone Tree received three patients with non-life threatening injuries, according to Linda Watson, a hospital spokeswoman, adding they would be discharged later Sunday.
County officials set up an emergency shelter for those displaced by the incident, citing the "size and scope of the investigation". It was not clear how many people checked into the shelter.
The apartment complex, in Highlands Ranch, an affluent suburban community in the county, is described on its website as "one of the friendliest apartments" in the area.
Reuters / Newshub.