It happened at the 14900 block of Valley Boulevard Saturday. Police responded to reports of gunfire, then the SWAT team followed.
Officials said the suspect, who lives inside a home at the trucking yard, got into an argument with a co-worker. Shots were fired, but the co-worker was not injured.
Authorities surrounded the home. After a standoff lasting several hours, they went in but the suspect was gone. A search is now under way.