FREMONT, Calif. (KRON) – All westbound lanes have been reopened following closures in the toll plaza of the Dumbarton Bridge, according to

The closure was due to a vehicle fire, according to California Highway Patrol, stemming from a vehicle explosion reported at 6:25 a.m. Monday. A multi-car accident was reported at the same time, including a big rig that was ablaze.

Firefighters were “attempting to put out the fire” from the eastbound lanes this morning, according to CHP, which stated that the No. 1 and 2 eastbound lanes were also blocked. These have re-opened as of 9:45 a.m. Monday.

Black smoke was visible, according to CHP. Commuters were told to expect delays.

The bridge, the San Francisco Bay’s shortest, connects Fremont in the East Bay with the Don Edwards San Francisco Bay National Wildlife Refuge on the Peninsula.

This is a developing story. Check back for updates.