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Fort Collins, Colo. • More evacuation notices have been issued as a wildfire in northern Colorado grew from 1,000 acres to more than 5,000 acres overnight.

In Arizona, strong wind gusts will likely keep spreading a wildfire that has grown to nearly 10 square miles and prompted the evacuation of a historic mining town.

The Colorado blaze northwest of Fort Collins is still only about 5 percent contained. Nearly 400 firefighters headed back to the fire lines on Thursday.

Two groups of residents have received notices to be prepared for possible evacuations, but no one has had to leave. The fire is within a quarter mile of some homes.

The U.S. Forest Service says the fire was caused by humans. The investigation into how it started is continuing.

In western Colorado, firefighters expected to have a 170-acre fire between Delta and Whitewater fully contained sometime Friday. That fire was started by lightning. No structures are threatened.

In Arizona, Fire incident spokeswoman Michelle Fidler says gusts of up to 40 mph are expected Thursday in the Prescott National Forest, near Crown King.

She says the wind could push the fire, which is only 5 percent contained, northward but crews will use the opportunity to slow the blaze from the west, where communication towers are threatened.

The fire has destroyed two homes and a trailer, and prompted an evacuation order Sunday. Crown King is a community of mostly summer homes about 85 miles north of Phoenix.

The blaze started at a home, but investigators have yet to determine the cause.