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Northern California wildfires may have killed hundreds of giant sequoias as they swept through groves of the majestic monarchs in the Sierra Nevada, an official said Wednesday.

“It’s heartbreaking,” said Christy Brigham, head of resource management and science for Sequoia and Kings Canyon national parks.

The lightning-caused KNP Complex that erupted on Sept. 9 has burned into 15 giant sequoia groves in the park, Brigham said.

Most saw low- to medium-intensity fire behavior that the sequoias have evolved to survive, Brigham said.

However, it appeared that two groves — including one with 5,000 trees — were seared by high-intensity fire that can send up 100-foot (30-meter) flames capable of burning the canopies of the towering trees.

That leaves the monarchs at risk of going up “like a horrible Roman candle,” Brigham said.

Two burned trees fell in Giant Forest, which is home to about 2,000 sequoias, including the General Sherman Tree, which is considered the world’s largest by volume. However, the most notable trees survived and Brigham said the grove appeared to be mostly intact.

Firefighters have taken extraordinary measures to protect the sequoias by wrapping fire-resistant material around the bases of some giants, raking and clearing vegetation around them, installing sprinklers and dousing some with water or fire retardant gel.

However, the full extent of the damage won’t be known for months, Brigham said. Firefighters are still occupied protecting trees, homes and lives or can’t safely reach steep, remote groves that lack roads or even trails, she said.

The KNP Complex was only 11% contained Thursday after burning 134 square miles (347 square kilometers) of forest. Cooler weather has helped slow the flames and the area could see some slight rain on Friday, forecasters said.

To the south, the Windy Fire had burned at least 74 sequoias, Garrett Dickman told the Los Angeles Times. The wildfire botanist has recorded damage as part of a sequoia task force preparing and assessing trees in the fire zone.

In one grove, Dickman counted 29 sequoias that were “just incinerated,” he told CNN.

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