SAN MATEO COUNTY (CBS SF) — Calfire crews on Friday afternoon were at the scene of a small vegetation for in Butano State Park, according to authorities.

The Calfire CZU posted about the fire on Twitter shortly after 3 p.m., saying the fire burning in the Butano area off of North Butano Truck Trail was about 1/4 acre in size. The fire was within the CZU Lightning Complex burn area, officials said

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The Calfire SCU is providing air support to fight the so-called Butano Fire.

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About 30 minutes later, officials said that ground crews had arrived at the scene of the remote fire.

Two hours later, the fire had grown to one acre, fire officials said.

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CBS SF is monitoring this developing story and will provide updates as information becomes available.