Visitors and staff at two national parks in the U.S. West have been evacuted because of wildfires. Officials at Black Canyon of the Gunnison National Park in Colorado say the park closed Thursday morning after lightning sparked blazes on both rims.

Evacuations have been ordered for the area north of Jacob Lake, in northern Arizona, due to the White Sage Fire.

In late June, a Grand Canyon National Park concessions employee contracted hantavirus, a rare but often fatal rodent-borne disease that plagues the American West, the National Park Service confirmed Monday.