(Reuters) - Tesoro Corp said a distillation unit was shut on Monday at its 166,000 barrel per day (bpd) San Francisco Bay area refinery in Martinez, California, after a malfunction.

Although the impacted unit is off-line, pending completion of investigation and resolution of the cause of the release, other operations continue at the refinery, said Tesoro spokeswoman Tina Barbee, in a statement.

The company said it expected it would be able to meet its supply commitments.

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