SAN LORENZO (CBS SF) — Fire crews in Alameda County were able to contain a two-alarm warehouse fire in San Lorenzo Wednesday afternoon, according to authorities.

The fire burning on the the 16500 block of Worthley Drive in San Lorenzo was first reported at 12:55 p.m., fire officials said.

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The Alameda County Fire Twitter account posted about the fire just after 1 p.m.

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Heavy, black smoke was rising from the fire, authorities said. Residents were asked to avoid the area. The fire was reportedly started on the roof of a warehouse.

Fire officials later said crews were able to isolate the fire to the roof of the building and prevent it from spreading to the interior of the warehouse.

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There were no known injuries. The cause of the fire is under investigation.