A fast-moving wildfire ripped through rolling hills and ranch land in rural northern California on Tuesday, after destroying 30 homes overnight and prompting more than 500 area residents to evacuate, fire officials said.

The so-called Clover Fire, which broke out on Monday afternoon, has already scorched some 7,400 acres near the rural community of Happy Valley in Shasta County, some 200 miles north of San Francisco, according to the California Department of Forestry and Fire Protection.

Temperatures above 100 degrees have made for tough conditions on the fire lines, and four people, three of them firefighters, have been treated for smoke inhalation, CalFire spokeswoman Teresa Rea said.

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