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A suspected human-caused wildfire had topped 450 acres Tuesday in Santaquin Canyon, but firefighters hoped the arrival of midweek thunderstorms and showers will help them douse the flames.

Fire Information Officer Reid Shelley said the specific origin of the blaze dubbed the Santaquin Fire remained under investigation, but it did not appear to have naturally ignited.

The fire, burning in mostly grass and oak brush about 3 miles southeast of the town of Santaquin, was 5 percent contained early Tuesday. Shelley said crews expected full containment by late Thursday.

"We had no growth overnight," Shelley said Tuesday. "It's laying down pretty well and the weather has cooperated so far with the winds [not rising]."

About 40 firefighters, aided by three water- and fire retardant-bearing helicopters and several engines, were battling the blaze.

In additional to U.S. Forest Service crews, firefighters from Utah and Juab counties, Payson, Genola and Salem were on the lines.

No injuries had been reported and no structures had been lost, or were being threatened by the fire.

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