By Elizabeth Wolfe, Holly Yan and Tina Burnside, CNN

(CNN) — Another grocery store turned into a scene of bloodshed after a gunman with an AR-15-style rifle opened fire, killing two people and injuring another, police said.

The tragedy unfolded shortly after 7 p.m. Sunday at a shopping center in Bend, Oregon, Police Chief Mike Krantz said.

A person believed to be the shooter was found dead at the scene. Police found an AR-15-style rifle and a shotgun close to that person's body, Krantz said.

The motive for the attack remains unclear. But it follows a spate of other grocery store shootings across the country in the past year and amid an overall surge in "active shooter" incidents, according to an FBI report.

Last September, a gunman shot 15 people -- including one fatally -- at a Kroger in Collierville, Tennessee. Some people hid in freezers to survive.

"I immediately turned to my children and said, 'Run!'"

Investigators believe the killer in Oregon entered the Forum Shopping Center from a nearby residential area and started shooting in the parking lot with an AR-15-style rifle, Krantz said.

The unidentified male shooter then crossed the parking lot and entered a Safeway grocery store, where he fatally shot someone in the entrance, Krantz said.

Police believe the shooter kept firing throughout the store, shooting and killing another person, the chief said.

Customers and employees said they scrambled for safety as bullets flew.

Josh Caba told CNN affiliate KTVZ he and his four children were shopping in the store when the shots broke out.

"We started heading to the front. Then we heard I don't know how many shots out front -- six or seven. I immediately turned to my children and said, 'Run!' People were screaming. ... it was a horrifying experience," Caba told KTVZ.

Caba said he was worried about his wife, who stayed in the car because she wasn't feeling well. But as he and three of his children fled through exit doors by the produce department, he found that his wife had driven to the back of the store and was "sitting in the car, saying 'Get in the car! Get in the car!'" KTVZ reported.

The father was able to rush back into the store and find their fourth child, he told KTVZ.

An employee who identified himself only as Robert told the Central Oregon Daily News that he and other employees were working a closing shift in the deli when they heard loud gunfire.

"Me and three other employees ran into a walk-in refrigerator and closed the door and stayed there and stayed hidden until authorities arrived," he said.

In addition to the two victims killed, a third victim was hospitalized in good condition at St. Charles Medical Center, spokesperson Lisa Goodman said.

'Get away from the window'

Residents in the central Oregon city were stunned that their community would be the site of the latest grocery store shooting

A woman who lives across the street from the Safeway said she initially thought the gunfire was an engine backfiring.

"I heard anywhere from five to eight shots. I thought it sounded like backfire," Heather Thompson told Central Oregon Daily News.

"Less than a minute later, there were 10 to 20 shots, and then another 10 to 20 shots. And by that time, I went inside and told my dad to get away from the window. And people were running out of Safeway."

When responding officers first entered the Safeway, they could still hear gunshots, the police chief said.

Krantz said it did not appear that any officers fired any shots. He said police believe the gunman acted alone.

But he said the investigation is still ongoing, and police are working to obtain warrants for homes in the area.

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