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A gunman remains at large after killing four women and wounding one man at a mall in Washington state, authorities said.

All those killed at the Cascade Mall in Burlington on Friday night were inside Macy's department store, said Sgt. Mark Francis, a spokesman for the state patrol.

One man suffered critical injuries, and was hospitalized.

Authorities believe only one shooter was involved and are searching for a man who headed toward Interstate 5 after the attack.

Moviegoers asked to leave

Witnesses described chaotic scenes and confusion when the shooting started about 7 p.m. local time

Brandi Montreuil said she was watching a movie at the mall when attendants suddenly told them to leave.

"I didn't know anything," she said. "The theater attendant came in and apologized for stopping the movie and said they (theater staff) were asked to have everyone leave immediately."

At first, she thought it was a drill.

"But you immediately think about what happened in Aurora, Colorado, so you start moving faster," she said, referring to the shooting at a movie theater in 2012 that left 12 dead.

When they got outside, they saw numerous police vehicles, but no officers in sight, Montreuil said.

"We didn't know if it was a fire so we were looking for smoke of some kind. Then a few officers started canvassing through the crowds asking if anybody saw anything."

An officer "with a large gun started yelling for people to leave, and fast," she said.

Scene outside #BurlingtonMallShooting. 4 deceased. Unknown how many injuries pic.twitter.com/5VOam5zypO — Brandon Stone (@Brandon_SVH) September 24, 2016

Armando Patino said he was working at a T-Mobile store near Macy's when he heard the commotion.

"Out of nowhere I just hear somebody yell and then after that, I turn around and just look at the Macy's and I just hear shots," Patino told CNN affiliate KOMO.

"I hear one shot and and then stand kinda still and like two three other people start running out saying, 'gun.' "

Some of the people dashed out of the Macy's store, unsure of where to go.

"I just moved them into the [T-Mobile] store," Patino said.

"We went in the back where we have a door ... and we just stayed there until they told us to evacuate."

Avoid mall area

Survivors were transported by bus to a nearby church.

Authorities warned people to stay indoors and avoid the mall area. Those who left their cars at the mall were told to check back the next day.

"Cascade Mall still an active scene," the Skagit County emergency office tweeted. "Stay alert. Call 911 if you see anything."

Officers using K-9 units searched the 434,000 square feet mall throughout the night, including in secure rooms, authorities said.

Manhunt underway

Police are sweeping stores in Cascade Mall, searching for at least one shooter, Francis said.

Authorities released a photo of a man they said was the shooter, saying he prowled the mall armed with a rifle.

Here is the shooter. We believe just one shooter. Notify authorities if you see him. Armed with rifle. pic.twitter.com/GXeWCPYnx5 — Sgt. Mark Francis (@wspd7pio) September 24, 2016

Francis said a manhunt is underway as police work on a few leads.

Washington State Trooper Rick Johnson told CNN they had reports that the suspect was behind some buildings headed to the freeway.

"They're canvassing the area right now, and ... (he) has not been located at this time," Johnson said.

The FBI office in Seattle said it is helping with review of intelligence. There's no information to suggest additional attacks were planned in the state, it tweeted.

'Stay close to ... loved ones'

Washington Gov. Jay Inslee said law enforcement officers were working to locate the shooter, and urged residents to follow instructions.

"Follow detour warnings, stay close to friends and loved ones as we await more information and, hopefully, news of the suspect's capture," he tweeted.

He sent his condolences to the families of the victims and prayers to those injured.

Burlington is about an hour north of Seattle.

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