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The “Rocky Mtn Fire 2016” has grown more than 2,000 acres since Wednesday evening. Shenandoah National Park officials say the blaze has now impacted 7,935 acres of parkland. The fire is 40 percent contained, The Washington Post reports, but officials estimate that the blaze won’t die down until next week.

Virginia Governor Terry McAuliffe visited crews this morning, thanking them for their efforts in containing the wildfire that erupted six days ago.

Thus far, more than 260 personnel, some arriving in helicopters, have been working to contain the fire through dry and windy conditions. Fire crews are providing structure protection to a couple of nearby communities.

Park officials received reports of the wildfire on Saturday—at the time it only covered 200 acres. The fire is currently burning laurel, pine, and oak forests with “heavier than average leaf litter and duff.” More than a dozen trails have closed since the fire took hold of the park’s south district.

Shenandoah National Park is located in Luray, Va., about 85 miles west of the District. It stretches 196 acres.

While the cause of the fire is under investigation, park officials expect that it’s likely human caused.