A multi-car crash involving a big rig led to one person being severely injured, said the south Sacramento California Highway Patrol.
The crash happened on eastbound State Route 12 just east of Rio Vista Bridge.
The person has been transported to the hospital for their injuries.
A SIG alert has been issued and one lane is open at this time so all westbound lanes on SR-12 will continue being closed for more than an hour, officials say.
The big rig has also not been towed yet due to traffic.
This is a developing story, stay with ABC10 for more information.