A fast-growing wildfire destroying homes in northwest Reno, Nevada, on Sunday was human-caused and uncontained, authorities said, as they encouraged some 90,000 people to evacuate. At least six people were injured. The Hawk Fire began Saturday and quickly grew to 20 square miles (53 sq. km.) as it spread across the Peavine Peak area of the Humboldt–Toiyabe National Forest, where rugged foothills are ringed by homes and businesses near the California state line. The fire moved exceptionally fast Saturday night, jumping over fire trucks and making it difficult for responders to get to hotspots while residents were trying to get out, Washoe County Sheriff Darin Balaam said. “It was extremely confusing,” the sheriff said, describing how changing winds sent the flames in different directions. Several structures were destroyed and the injured included three civilians and three first responders, officials said. They did not provide additional details on how the fire was started, saying it was under investigation. Unpredictable fire expands danger zone Some 42,000 residents have been ordered