UPDATE: Calf Fire contained; cause is mower clearing star thistle

Atascadero News Photo courtesy of Alie Reilly McKee - This photo shows some of the charred damage from the Calf Fire.

The Calf Fire outside Santa Margarita is now 100 percent contained.

Crews will remain on the scene for a while for mop-up duty. Evacuations are lifted and all roads in the area are open, but use caution when driving in the area, as firefighters are still working.

According to a release from CAL FIRE, the cause was equipment use. The landowner was clearing star thistle, an invasive weed, with a mower.

This fast-moving wildland fire broke out on Monday afternoon and quickly burned 640 acres of grass, old growth brush and oak woodlands in the Parkhill area. In the last 50 years, CAL FIRE has no recorded fire history for this area. No structures were damaged and one firefighter received minor injuries.

"This fire fight was successful thanks to the aggressive fast attack by firefighters, homeowners doing their part by creating defensible space around their homes, and a pre-attack plan developed by CAL FIRE with funds from the Fire Safe Council," said Fire Chief Robert Lewin.

At the height of the fire more than 900 firefighters were assigned to fight it. These firefighters came from many local, state and federal agencies. The San Luis Obispo County Sheiff's Department, California Highway Patrol, the American Red Cross and the Horse Emergency Evacuation Team are credited with an effective and timely evacuation.