A Grand Canyon water treatment facility located at the North Rim caught fire on Saturday, causing chlorine gas to be released into the air. Multiple closures are being enforced due to the incident.

Authorities maintained the evacuation zones for the White Sage Fire north of the Grand Canyon as the fire grew expectantly.

A wildfire burning in Grand Canyon National Park triggered a chlorine gas leak Friday afternoon after flames reached a water treatment facility.

Officials evacuated Jacob Lake and the North Rim of the Grand Canyon was closed to visitors because of the fast-moving White Sage wildfire.

The lightning-sparked South Rim fire in Black Canyon of the Gunnison National Park has burned 3,556 acres with no containment and mandatory evacuations remain in place.

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.

The visitor center, the gas station and a waste water treatment plant also were lost, along with some employee housing and an administrative building.

The Wright Draw Fire, near Gateway, Colorado, burned an estimated 34 acres Friday afternoon, according to the Upper Colorado River Interagency Fire Management Unit. Aerial crews continue to monitor the fire as plans to suppress it are underway.