LIVERMORE (CBS SF) — Crews were at the scene of a hazardous materials incident in the Altamont area of unincorporated Alameda County that prompted a road closure Friday afternoon, authorities said.

The California Highway Patrol received a report shortly after 10 a.m. about barrels of materials that were dumped in a creek along Altamont Pass near Carroll Road.

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Hazmat Spill Altamont

Crews at the scene of a hazardous materials incident along the Altamont Pass. (CBS)

The report indicated that there were up to 55 gallons of materials spilled but that it was apparently not related to a traffic accident. CHP officials were not able to confirm details on the incident and said the U.S. Fish & Wildlife Service was handling it.

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An Alameda County fire dispatcher confirmed that their personnel were also at the scene.

At 1:10 p.m., the CHP issued a Sig-alert announcing that Altamont Pass was closed between Carroll and Greenville roads due to a spill cleanup. It’s not expected to reopen until about 7 p.m.

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