UPDATE (3:40 p.m.) CAL FIRE says the Llano Fire has grown to 21 acres.
Officials report that the Atascadero Community Center is open to all evacuees.
UPDATE (3:25 p.m.) Evacuations are in order for residents in zone ATA-002, which spans the area west of Highway 101 to Serrijon Road.
People living as far north as Del Rio Road and as far south as Santa Lucia Road have been ordered to leave their homes.
CAL FIRE is calling the blaze the Llano Fire.
The agency says the cause of the fire is under investigation.
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ORIGINAL (2:45 p.m.) Firefighters are battling a 20-acre vegetation fire in Atascadero that sparked on Saturday afternoon, according to the San Luis Obispo County Fire Department.
The fire reportedly began around 1:45 p.m. at 6705 Llano Road, threatening several structures.
Fire officials say evacuations have been issued in the area.
The San Luis Obispo County Fire Department adds that crews are battling additional concern areas near Corriente Road and Balboa Road.
Several resources have reportedly been sent to the scene, including air tankers, helicopters, fire engines, and dozers.
Officials are encouraging people to avoid the area and yield to emergency traffic.
This story will be updated as more information becomes available.