CHP San Francisco tweeted around 2:45 p.m. that there was a fire under the Bay Bridge west of Treasure Island.
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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.
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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.