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GRAND CANYON NATIONAL PARK, Ariz. (AP) 鈥� 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.

But then came a sudden and extreme shift in the wind that far exceeded forecast conditions, the agency recounted Tuesday in an email sent to The Associated Press.

鈥淭he Dragon Bravo Fire began July 4 as a lightning-caused wildfire and was under a full suppression strategy from the outset,鈥� the agency said, adding that the team first assigned to the fire 鈥渆ffectively managed the fire through its initial phase鈥� and that Grand Canyon National Park requested additional resources as fire activity increased.

The Park Service had posted on social media last week that the fire was being managed under a 鈥渃onfine and contain strategy,” which allowed for the natural role of fire on the landscape while minimizing the risk to infrastructure and other values.

Arizona’s governor and members of the state’s congressional delegation called for an investigation as the Park Service immediately came under scrutiny after the lodge and other historic buildings were destroyed.

The flames were fanned by uncharacteristic nighttime gusts that topped 40 mph (65 kph), said fire information officer Stefan La-Sky.

鈥淣ormally the fire 鈥榣ays down鈥� at night because of higher humidity and lower temperatures, but this thing was really wind-driven,鈥� La-Sky said Tuesday, adding that it is extremely dry across the region.

The weather was more favorable Tuesday as hundreds of firefighters worked to stop the Dragon Bravo Fire from consuming any more of the buildings along the park鈥檚 less-visited North Rim, including a water pumping station that supplies the South Rim, La-Sky said.

A separate blaze dubbed the White Sage Fire was burning further north. Together, the two fires have charred more than 90 square miles (233 kilometers). That is more than twice the size of the entire Walt Disney World complex in Florida.

Tourists standing along the park鈥檚 popular South Rim on Tuesday watched plumes of smoke rise above the sweeping vista, filling the canyon with a thick haze and pooling in its depths.

鈥淏y the afternoon, it was completely socked in,鈥� Christi Anderson said of the smoke that had filled the canyon the day before. 鈥淵ou couldn鈥檛 see anything, none of that. It was crazy.鈥�

Anderson was visiting from California and considered herself lucky because she had shifted her reservation to the South Rim in the preceding days. Otherwise she would have been among those forced to evacuate.

Park officials have closed access to the North Rim, a more isolated area that draws only about 10% of the Grand Canyon鈥檚 millions of annual visitors. The park spans more than 1,900 square miles (4,920 square kilometers).

Neither blaze had any containment, and La-Sky said it was too early for his team to offer a timeline.

鈥淲e鈥檙e always at the mercy of Mother Nature,鈥� he said.

Over the years, managers at the Grand Canyon have successfully used fire to benefit the landscape, with the park having what some experts say is an exemplary fire management program that has tapped both prescribed fire and wildfires to improve forest health.

Andi Thode, a professor of fire ecology and management at Northern Arizona University and the lead at the Southwest Fire Science Consortium, said park managers have even re-burned some areas in multiple places over the years to create what she called 鈥渙ne of the best jigsaw puzzles鈥� on public land. She noted that fire behavior decreased significantly when the Dragon Bravo Fire burned into the footprint of a previously burned area.

鈥淪o creating that heterogeneity across the landscape, using fire is a really critical tool moving forward to be able to help in the future with these wildfire events that are happening at the worst time in the worst weather conditions with the driest fuels,鈥� Thode said.

The park’s 2025 fire management plan notes the Grand Canyon’s , referencing cultural and natural resources, spiritual and inspirational qualities, recreational opportunities and other values.

鈥淚t is the Fire Management Program鈥檚 mission to manage wildland fires to preserve, enhance and (where necessary) restore these values,鈥� the plan reads.

Those areas that have the most infrastructure and are among the most highly used by the public make up just over 1% of the park. According to the plan, managing wildfires for resource benefit objectives within these areas is not permitted and that the overall intent within these areas is to 鈥減rotect life and property in its natural setting.鈥�

The fire exclusion areas listed in the plan include the developed area of the North Rim.

Aside from outlining policies for responding to wildfires and planning for prescribed fires, the document includes links to tools that fire managers can use for assessing risk. The lodge and surrounding cabins were among the more than 370 structures at the park that were considered high risk. Another 238 structures fall in the moderate risk category.

The Park Service reiterated Tuesday that the safety of the public and firefighters come first.

鈥淔irefighters are continuing to respond to this fire in the safest way possible putting their lives and the lives of the community, park visitors, and park employees ahead of buildings.鈥� the agency said.

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Montoya Bryan reported from Albuquerque, New Mexico, and Seewer reported from Toledo, Ohio. Associated Press writers Christopher Keller in Albuquerque, New Mexico, and Safiyah Riddle in Montgomery, Alabama, contributed to this report.