2 Dead in Shooting at Walmart Distribution Center in California, Including Gunman

Mr. Lister said he had seen blood dripping from his colleague’s arm.

“That’s when I realized it wasn’t a drill,” he said.

Mr. Lister and his co-workers ran out the nearest fire exit.

As they were running, he said, they heard 50 to 60 gunshots — at which point they picked up their speed and helped each other over a barbed-wire fence.

When Mr. Lister looked back at the building, he saw that a white vehicle had rammed into an entrance, he said. The glass that had shattered from the crash caused his colleague’s arm to bleed, he said.

“To hear that much gunfire, it was frantic,” said Mr. Lister, who unloads deliveries that are then repackaged and shipped to Walmart stores. “People were running as fast as they could move.”

Walmart employees said a man drove around the facility’s parking lot four times around 3:30 p.m. local time, Lieutenant Borden said. The man crashed into the building and started firing with a semiautomatic rifle, she said.