Traffic was being diverted at Main Street to Francisco Boulevard.
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CHP officers responded to a call of a possible freeway shooting in the area of westbound I-580 at Main Street after a victim reported an occupant in another car brandished a handgun and fired a shot at their vehicle.
The CHP says an inspection of the vehicle showed damage consistent with a bullet hitting the side.
The westbound lanes were reopened around 7:30 p.m.