CLAYTON -- Evacuations were under way late Friday as firefighters from multiple jurisdictions battled a large vegetation fire in a remote section of Marsh Creek Road and Aspara Drive, authorities said.

Shortly after midnight, the fire was reported to be at least 100 acres and roughly 50 percent contained, its forward progress stopped, according to fire officials. At least four homes along Bragdon Way were threatened by the flames, and evacuations had been ordered there shortly before 11:30 p.m., fire officials said.

Marsh Creek Road was closed as far east as Deer Valley Road and was expected to remain closed for at least eight hours while fire crews worked to contain the flames.

The fire was triggered after a car caused power lines to fall as it careened down an embankment around 10 p.m. No one was injured in the crash, but the fire, which started at around a half acre, quickly grew.

Units from Cal Fire as well as backup Contra Costa Fire Protection District were called to help contain the fire.

PG&E crews were headed to the scene to repair a toppled utility pole and the downed wires. It was unknown how many customers may have been affected by power outages, nor was it clear when the pole would be repaired, although crews said they hoped to have it fixed tonight.

Check back for updates.

Contact Katie Nelson at 408-920-5006 and follow her at Twitter.com/katienelson210.



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CalFire firefighters and members of CalFire’s inmate fire crew extinguish hot spots as they mop-up a 150 acres wildland fire on Marsh Creek Road in
CalFire firefighters and members of CalFire's inmate fire crew extinguish hot spots as they mop-up a 150 acres wildland fire on Marsh Creek Road in Clayton, Calif., on Saturday, July 12, 2014. The fire started at approximately 10 p.m. on Friday after a car crashed into a utility pole causing the power lines to fall sparking the blaze. (Doug Duran/Bay Area News Group)

A member of CalFire’s inmate fire crew extinguishes hot spots as they mop-up a 150 acres wildland fire on Marsh Creek Road in Clayton, Calif., on
A member of CalFire's inmate fire crew extinguishes hot spots as they mop-up a 150 acres wildland fire on Marsh Creek Road in Clayton, Calif., on Saturday, July 12, 2014. The fire started at approximately 10 p.m. on Friday after a car crashed into a utility pole causing the power lines to fall sparking the blaze. (Doug Duran/Bay Area News Group)

A CalFire firefighter walks on a hilltop as he and others extinguish hot spots as they mop-up a 150 acres wildland fire on Marsh Creek Road in Clayton,
A CalFire firefighter walks on a hilltop as he and others extinguish hot spots as they mop-up a 150 acres wildland fire on Marsh Creek Road in Clayton, Calif., on Saturday, July 12, 2014. The fire started at approximately 10 p.m. on Friday after a car crashed into a utility pole causing the power lines to fall sparking the blaze. (Doug Duran/Bay Area News Group)