SAN FRANCISCO, California (NBC NEWS) -- It was a nightmare of a commute for hundreds of thousands across California's San Francisco Bay area this morning after workers for the city's mass transit system went on strike.

More than 400,000 daily BART riders have to find another way to get around the bay area, causing massive gridlock on the roads.

Even a federal mediator could not bring both sides to an agreement Thursday when talks broke off.

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