The mayhem began at around 3 p.m., when the shooter rammed his vehicle into the Red Bluff City building about 131 miles north of Sacramento, starting a small fire, CNN reported.
Then the sound of gunfire was heard, and responding police officers shot the suspected gunman, KHSL-TV reported.
His condition wasn’t released, the station said.
But hospital officials told the station that the four hospitalized victims were all in fair condition.
The shooter had first circled the parking lot four times before crashing into the building with his semi-automatic long gun, the Record-Searchlight newspaper reported,. citing Tehama County Assistant Sheriff Phil Johnston.
The shooter used an “AR-type weapon,” emergency dispatchers told the newspaper.
There were about 200 workers inside the facility, some of whom locked themselves in a room, employees told KHSL-TV.
Survivor Scott Thammakhanty, an employee who unloads trucks at the facility’s receiving center, told the Record-Searchlight that the shooting “went on and on — I don’t even know how many times he fired.”
As he and others ran for their lives, they passed other people lying on the ground, he told the paper.