A group of truck drivers halted commerce at one of the Port of Oakland’s biggest terminals Monday to protest work conditions and the rising costs of hauling cargo out of the busy seaport.

Truckers and their supporters picketed outside three entrances to the SSA Marine terminal and effectively shut down cargo traffic because crane operators and other terminal workers refused to cross the protest line. About 100 ralliers gathered before dawn. By 9 a.m., the company that runs the terminal informed the port that it was closing down.

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