All northbound lanes at Broadway are closed. Traffic is being diverted off the freeway at Oak Street then back onto I-880 at Jackson Street, according to California Highway Patrol.
A traffic alert was issued for the area, where there is already a major backup. There is no estimated time of reopening.
There is a large police presence at the scene.
Our SKY7 chopper was over the police activity, showing officers surrounding a black Honda Civic.
Stay with ABC7 News for the latest details on this developing story.