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AGUA DULCE, Calif. (AP) _ A wildfire spread quickly in wind and simmering heat Saturday, briefly threatening dozens of homes and power lines.

A voluntary evacuation for about 250 homes was in effect, but the homes weren't in immediate danger as erratic winds that had fanned the flames diminished Saturday evening.

The 1,250-acre blaze in north Los Angeles County was 40 percent contained by evening, fire Capt. Brian Jordan. The cause wasn't known.

Some people kept horse trailers ready to take animals out of the area.

Protecting residences was difficult because houses and ranches were scattered throughout a wide swatch of dry, brushy canyons and ridges 40 miles north of Los Angeles.

Triple-digit temperatures were recorded in Southern California valleys and deserts.