CHP San Francisco tweeted around 2:45 p.m. that there was a fire under the Bay Bridge west of Treasure Island.
RELATED: Live traffic maps, backup info
A San Francisco fire boat was spraying water on the underside of the bridge and CHP had at least some of the eastbound lanes blocked.
The fire appeared to be out as of 2:55 p.m. and all lanes were reopened shortly after.
Stay with ABC 7 News for more on this breaking news story.