Evacuations are under way in central and southern Utah as winds whipped up wildfires, burning buildings.

A wildfire burning in Nephi Canyon has grown from a spark this afternoon to more than 5,000 acres and is now threatening the town of Indianola and several subdivisions.

"It will continue to grow," said Charmaine Thompson with the Uinta National Forest.

The U.S. Forest Service said it started at a KOA campground about 6 miles east of Nephi. The campground, a nearby motel and several vehicles have been reported destroyed.

State Route 132 from the Nebo Loop turnoff to Fountain Green has been closed.

The fire is human-caused. Authorities were investigating reports that a vehicle's brake pads created sparking.

The wildfire burned a 138,000-volt transmission line, knocking out electricity for much of Sanpete County. After hours without electricity in 99 degree heat, Rocky Mountain Power crews were able to restore service a short time ago.

About 25 people were evacuated from the Hamlin Valley as a wildfire whipped up Thursday afternoon in Iron County near the Utah-Nevada border.

"We've already lost an undetermined amount of structures," Color Country Fire Management's LaCee Bartholomew told the Deseret Morning News.

Air tankers, water tender trucks, fire engines and fire crews were dispatched to create lines as the Paradise Fire grew.

"There's a lot of fuel out there," Iron County Sheriff's deputy Jody Edwards said. "It's going to be scary."

Fire officials estimate the fire has burned nearly 4,000-acres.