The fire was reported about 11 a.m.
Cal Fire said the fire is 0-percent contained at this point.
A fast-moving brush fire near Bonsall has charred 150 acres, destroyed two buildings and damaged 12 others and prompted mandatory evacuations in the area.
Keith Brackpool, the chairman of Santa Anita which owns San Luis Rey Downs, said stable personnel had no choice but to let horses loose to get them away from the barns.
"They said they've never seen anything like it", Machowsky added. & Sullivan Middle School in San Diego County due to the Lilac Fire. Jerry Brown declared a state of emergency in San Diego County on Thursday after one of six wildfires began rapidly burning in the area.
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Smoke from the Lilac Fire is visible from an automated camera on Red Mountain near Fallbrook. Keith Brackpool, chairman of West Coast operations for The Stronach Group at Santa Anita, noted that transportation between tracks was made hard because the fire around San Luis Rey necessitated significant road closures.
A post on O'Neill's Facebook page indicated that O'Neill's assistant Leandro Mora was on site at San Luis Rey to assist with the evacuation process. "This is that worst-case scenario that we prepare for but hope doesn't happen".
Various reports indicated that the fire crossed some of the main roads around the training center. Southern California horsemen need it right now. It's unclear where those horses came from. The highway is within a few hundred yards of the training center.
The Del Mar Fairgrounds was opened as an evacuation center for livestock, and 130 animals had been brought to the facility as of around 5 p.m. County officials urged livestock owners to evacuate their animals well ahead of time.
One ranch hand was injured as a horse he was trying to rescue kicked him in the face.