The Pine Gulch fire, a lightning-sparked blaze raging north of Grand Junction, continued to grow overnight, becoming the fifth largest wildfire in Colorado state history, officials said Thursday.

Burning since July 31, the fire grew more than 16,000 acres, from 51,455 acres Wednesday to 68,323 acres Thursday, according to the Bureau of Land Management. Nearly 750 firefighters continue to battle the blaze, but were unable to make any headway in the face of high heat and gusty winds.

The fire remained 7% contained as of Thursday morning and officials expected it to continue growing.

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