The lightning-caused wildfire that consumed roughly 70 structures seemed unremarkable for days. High winds changed that.

Firefighters are trying to contain the Dragon Bravo Fire on the Grand Canyon’s North Rim and keep it from destroying more buildings.

Nearly 400 firefighters are working around the clock on the Dragon Bravo Fire burning on the North Rim of Grand Canyon National Park, Tuesday.

Abnormally dry, hot conditions near the Grand Canyon's North Rim allowed the Dragon Bravo Fire to grow rapidly.

The Dragon Bravo Fire on the North Rim of Grand Canyon National Park is exhibiting “extreme and volatile fire behavior,” park officials said in a release Sunday.

Grand Canyon National Park evacuated Phantom Ranch and areas of the inner canyon after the rapidly growing Dragon Bravo Fire led to the leak of poisonous gas.

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.

It took one week for a naturally occurring wildfire at Grand Canyon National Park to grow from a low-level threat to a full-on disaster. On July 4, a lightning strike ignited a wildfire on the North Rim of Grand Canyon National Park.