A wildfire that's burned 20 homes in San Diego County is roaring westward and fire officials say it could reach the sea.

Santa Ana winds have driven the flames over 6 ½ square miles of the northern county. Authorities Thursday night say it could reach Oceanside and the Camp Pendleton Marine Base. Evacuations have been ordered for nearby areas.

The fire has ravaged trailer homes in a retirement community in Fallbrook and killed race horses at an elite training facility.

Authorities say three people were hospitalized with burns and two firefighters were injured battling the flames.

The fire is one of six that have burned dozens of homes and prompted mass evacuations from north of Los Angeles southward nearly to San Diego.