Minutes later, an officer arrived and exchanged gunfire with the gunman.
“I’m told it was quite a bit of gunfire,” she said.
Another officer arrived on scene shortly after, and the gunman was shot at 3:48 p.m. The authorities did not publicly identify the man, saying they had not yet been able to reach next of kin.
Lieutenant Borden identified the victim as Martin Haro-Lozano, a Walmart employee.
She said the sheriff’s office had not yet identified a motive for the shooting. She said Walmart shooting was not connected to one earlier in the day in Shingleton, Calif., in which three people were killed.
A Walmart employee, Scott Thammakhanty, told The Record Searchlight, a newspaper in Redding, Calif., that he had heard gunshots and had seen people on the ground as he and other employees ran. He said that the gunman looked familiar but that he did not know his identity.
A number of employees barricaded themselves in the back of the distribution center, according to police radio transmissions at the time.
Scott Pope, a Walmart spokesman, said the company was deeply saddened by the incident.
“Our focus is on supporting our associates, as well as their families and co-workers in the facility,” he said in a statement. “This is an active police investigation and we will continue to work with Tehama County Sheriff’s Office and assist in their investigation in any way possible.”
Lacie Miller, the 37-year-old assistant manager of a nearby convenience store, said employees who had gathered outside of the building said that the vehicle crash had caused a fire at the distribution center.