A fast-moving brush fire in California’s Cleveland National Forest forced evacuations in nearby areas on August 6.

The Holy Fire started just after 1 pm on Monday and quickly grew to 100 acres, according to the Orange County Fire Authority. Official reports said the fire had spread to over 4,000 acres by midnight.

The Orange County Fire Authority said two firefighters were treated for heat exhaustion on Monday afternoon.

This footage from the Nevada Seismological Lab shows the fire burning from Santiago Peak East in Cleveland National Forest from Monday afternoon to night. Credit: Nevada Seismological Lab via Storyful