CONTRA COSTA COUNTY, Calif. (KRON) — Crews have fully contained a two-alarm brush fire Friday afternoon in Pittsburg, Contra Costa fire officials announced on Twitter. The fire on Kirker Pass Road was at approximately 90 acres when it was fully extinguished around 5:30 p.m.

Concord police said Kirker Pass Road was closed in both directions but has now reopened. The Contra Costa County Fire Protection District said the fire was “rapidly spreading” in the area of Kirker Pass Road and Hess Roads. As of 2:53 p.m., the fire was at 105 acres, according to Cal Fire.

An investigation revealed that a malfunctioning vehicle caused the fire, officials said. Authorities were advising residents to avoid the area to allow emergency crews to access the area.

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The Contra Costa Fire Protection District first tweeted about the fire at 12:48 p.m. Kirker Pass Road runs between the cities of Concord and Pittsburg.