WEED, California: Thousands of people remained under evacuation orders on Saturday after a wind-whipped wildfire raged through rural northern California, injuring people and torching an unknown number of homes.

The fire that began on Friday afternoon on or near a wood-products plant quickly blew into a neighborhood on the northern edge of Weed, but then carried the flames away from the city of about 2,600.

Suzi Brady, a spokesman for the California Department of Forestry and Fire Protection (Cal Fire), said several people were injured.

Allison Hendrickson, spokesman for Dignity Health North State hospitals, said two people were brought to Mercy Medical Center Mount Shasta. One was in stable condition and the other was transferred to the University of California Davis Medical Center, which has a burn unit.

Rebecca Taylor, communications director for Roseburg Forest Products based in Springfield, Oregon, said it was unclear if the fire started near or on company property. A large empty building at the edge of company property burned, she added. All employees were evacuated, and none are yet to report injuries.

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The blaze, dubbed the Mill Fire, was pushed by 35-miles-per-hour (56-kilometers-per-hour) winds and quickly engulfed 4 square miles (10.3 square km) of ground.

The flames raced through tinder-dry grass, brush and timber. About 7,500 people in Weed and several nearby communities were under evacuation orders.

Dr. Deborah Higer, medical director at the Shasta View Nursing Center, said all 23 patients at the facility were evacuated, with 20 going to local hospitals and three staying at her own home, where hospital beds were set up.

Gov. Gavin Newsom declared a state of emergency for Siskyou County and said a federal grant had been received "to help ensure the availability of vital resources to suppress the fire."

At about the time the blaze started, power outages were reported that affected some 9,000 customers, and several thousand remained without electricity late into the night, according to an outage website for power company PacifiCorp, which said they were due to the wildfire.

It was the third large wildfire in as many days in California, which has been in the grip of a prolonged drought and is now sweltering under a heat wave that was expected to push temperatures past the 100-degree mark in many areas through Labor Day.

Thousands also were ordered to flee on Wednesday from a fire in Castaic north of Los Angeles and a blaze in eastern San Diego County near the Mexican border, where two people were severely burned and several homes were destroyed. Those blazes were 56 percent and 65 percent contained, respectively, and all evacuations had been lifted.

The heat taxed the state's power grid as people tried to stay cool. For a fourth day, residents were asked to conserve power on Saturday, during late afternoon and evening hours.

The Mill Fire was burning about an hour's drive from the Oregon state line. A few miles north of the blaze, a second fire erupted Friday near the community of Gazelle. The Mountain Fire has burned more than 2 sq mi (6 sq km), but no injury or building damage was reported.

The whole region has faced repeated wildfires in recent years. The Mill Fire was only about 30 mi (48 km) southeast of where the McKinney Fire erupted in late July. It killed four people and destroyed dozens of homes.