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GRAND JUNCTION, Colo. (AP) — A wildfire burning in western Colorado has grown to over 18 square miles in hot and dry conditions that are expected to continue through Friday.

The Pine Gulch Fire 18 miles north of Grand Junction was started nearly a week ago by lightning. It is burning in remote and rough terrain in Mesa and Garfield counties.

Meanwhile, a wildfire that broke out west of Glenwood Springs shut down Interstate 70 in both direction for several hours on Wednesday.

A red flag warning is in effect Thursday for much of western Colorado along with parts of Utah, Wyoming and Idaho.