The Monday mass shootings in Half Moon Bay, Northern California, appear to be a case of workplace violence, officials said on Tuesday.
"All of the evidence we have points to this being the instance of workplace violence," San Mateo County Sheriff Christina Corpus said.
The only known connection between the 66-year-old suspect and the victims is that they may have been coworkers, according to the San Mateo County Sheriff's Office.
The mass killing took place at two mushroom-growing locations. Multiple victims were found in both scenes.
The victims, seven men and one woman, were Asian or Hispanic, Corpus said.
As of Tuesday, the one injured victim was in stable condition after receiving surgery, Corpus noted.
The suspect was taken into custody peacefully on Monday afternoon in the parking lot of a San Mateo County Sheriff's substation in Half Moon Bay. A semi-automatic handgun was found in his vehicle.
The Sheriff's Office said the firearm was legally purchased and owned.
Produced by Xinhua Global Service