Drivers heading east on the Bay Bridge are warned to expect delays Wednesday afternoon due to police activity on the span near Treasure Island.
A person has climbed over the bridge's railing, the California Highway Patrol said.
All lanes re-opened shortly before 4 p.m., but traffic is still backed up
Travelers intending to use the bridge should look for alternate routes, the San Francisco Department of Emergency Management said.
This is a developing story.