A manhunt is under way in the US state of Washington for a gunman who opened fire with a rifle in a shopping mall and killed five people before disappearing under the cover of darkness.
The suspect entered the Cascade Mall in Burlington, around 105km north of Seattle, and began shooting about 7pm local time on Friday in the cosmetics section of a Macy's department store, police said.
The unidentified suspect, who police described on Twitter as a Hispanic male, initially walked into the shopping centre without the rifle but surveillance video later caught him brandishing the weapon, said Lt Chris Cammock of the Mount Vernon Police Department at a briefing on Saturday.
A security camera image of the suspect in the mall (Washington State Patrol)
The rifle was later recovered at the mall, said Mr Cammock, who is commander of the Skagit County Multi-Agency Response Team.
Four women were killed in the rampage, which police believe was carried out by a lone gunman. Later a man who was seriously wounded in the shooting died at a local hospital. None of the victims were identified.
Steve Sexton, the mayor of Burlington, described the shooting as a "senseless act".
"It was the world knocking on our doorstep and it came to our little community here," he said before acknowledging the response by law enforcement. "I know now our support goes with them to bring this son of a bitch to justice."
Authorities offered no information about a possible motive for the attack, which followed a series of violent outbursts at shopping centres across the US, including the stabbing of nine people at a Minnesota centre last weekend.
"We have no indication that we have a terrorism act," said Michael Knutson, assistant special agent in charge of the Federal Bureau of Investigation's Seattle office. "I can't discount that, but I can't conclude it either."
After the shooting, police and rescue workers worked their way through the mall, clearing stores and evacuating shoppers, some of whom locked themselves in dressing rooms. The mall remained closed on Saturday as investigators sifted for evidence and attempted to recreate the crime scene.
Mr Cammock said police had no clues about the identity or whereabouts of the suspect, and asked the public for help in tracking him down.
Authorities released a grainy photo of the suspect taken by a surveillance camera. It shows a young male in his late teens or mid-20s with short dark hair, dressed in dark shorts and T-shirt and carrying a rifle.
Local authorities searched through the night for the gunman and warned residents to remain indoors, though later said the area was safe.
The suspect was last seen walking toward an interstate highway that runs past the mall, which is 72km south of the Canadian province of British Columbia.