Fireworks may have sparked a fire that caused two eastbound lanes of the Bay Bridge to close Sunday night.
As of Monday morning, the lanes were reopened, though the westbound Treasure Island offramp remains closed, for cleanup.
Lanes were closed to allow firefighters access to a vegetation fire on Yerba Bueno Island reported just before 8 p.m. Sunday south of the bridge on the western side of the island, according to the California Highway Patrol.
The fire sent up a large plume of smoke and visible flames, and caused a severe traffic backup on the approach to the Bay Bridge through San Francisco.
San Francisco fire officials did not immediately respond to calls seeking information. But investigators said fireworks may have sparked the fire.
In addition to the fire, a Greyhound bus and two others cars were involved in a crash on the Bay Bridge. The crash happened on the new eastern span at about 10 p.m. Sunday night, which added to the traffic jam on the bridge.