The National Park Service is defending its handling of a lightning-sparked wildfire that destroyed the nearly century-old Grand Canyon Lodge and dozens of historic cabins, saying containment lines had been built around the blaze and crews were prepared to conduct defensive firing operations.

A wildfire on the Grand Canyon’s North Rim has consumed some 5,000 acres and destroyed between 50 and 80 structures, including National Park Service administrative buildings, visitor facilities, a gas station and a water treatment plant.