A fire under the Bay Bridge is causing major traffic delays for eastbound Interstate 80 drivers Tuesday afternoon.

Authorities say the fire has been extinguished and all lanes are open, however, traffic is a mess.

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California Highway Patrol San Francisco tweeted at 2:45 p.m. about the fire burning under the eastern span of the bridge.

The small debris fire broke out under the eastbound lanes just west of Treasure Island.

San Francisco Fire Department’s Fireboat was able to extinguish the fire.

The cause of the fire is unknown and under investigation.

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