Two vehicles collided on Adobe Road east of Petaluma Tuesday afternoon, leaving at least one person with major injuries, according to initial reports.
The vehicles crashed just before noon on Adobe Road at Frances Way, not far from Corona Road.
One person was trapped inside the wreckage and needed to be freed by firefighters.
The wreckage blocked the southbound lane of Adobe Road, according to the CHP.
An ambulance was responding. Initial reports indicated one person had minor injuries and one had serious leg injuries.