The largest grove of giant sequoias in Yosemite National Park remained closed Saturday as firefighters battled a blaze that threatened the gathering of the iconic trees and forced hundreds of campers to evacuate.

The rest of the park in California remained open, though smoke that hung in the air obscured some of the most scenic vistas and views.

More than 500 mature sequoias were threatened in the Mariposa Grove but as of Saturday afternoon there were no reports of severe damage to any named trees, including the 3,000-year-old Grizzly Giant. Some of the massive trunks were wrapped in fire-resistant foil for protection as the blaze burned out of control.

The cause of the fire was under investigation.

Beyond the trees, the small community of Wawona, which is surrounded by park and a campground, was under threat, with people ordered to leave their homes and campsites on Friday night.

The fire was proving difficult to contain, with firefighters throwing “every tactic imaginable" at it, said Nancy Phillipe, a Yosemite fire information spokesperson. That included air drops of fire retardant as well as the planned use of bulldozers to create fire lines, a tactic that's rarely used in a wilderness setting like Yosemite, Phillipe said.

The bulldozers would primarily be used to put in fire lines to protect Wawona, she said. About 600 to 700 people who were staying at the Wawona campground in tents, cabins and an historic hotel were ordered to leave.

Though firefighters were facing hot and dry conditions, they didn't have to contend with intense winds on Saturday, said Jeffrey Barlow, senior meteorologist with the National Weather Service in Hanford. Given the relatively small size of the fire and minimal winds, smoke impacts were not expected to stretch far beyond the park, he said.

The giant sequoias, native in only about 70 groves spread along the western slope of California’s Sierra Nevada range, were once considered impervious to flames but have become increasingly vulnerable as wildfires fueled by a buildup of undergrowth from a century of fire suppression and drought exacerbated by climate change have become more intense and destructive.

Lightning-sparked wildfires over the past two years have killed up to a fifth of the estimated 75,000 large sequoias, which are the biggest trees by volume.

There was no obvious natural spark for the fire that broke out Thursday next to the park’s Washburn Trail, Phillipe said. Smoke was reported by visitors walking in the grove that reopened in 2018 after a $40 million renovation that took three years.

The fire had grown to about 1.9 square miles (4.8 square kilometers) by Saturday evening.

A fierce windstorm ripped through the grove a year-and-a-half ago and toppled 15 giant sequoias, along with countless other trees.

The downed trees, along with massive numbers of pines killed by bark beetles, provided ample fuel for the flames.

The park has used prescribed burns to clear brush around the sequoias, which helps protect them if flames spread farther into the grove.

Meanwhile, most evacuation orders were lifted Saturday in the Sierra foothills about 80 miles (128 kilometers) to the northwest of the Yosemite fire, where a fire broke out on July 4. The Electra Fire that began near Jackson was mostly contained, and only areas directly within the fire's perimeter remained under evacuation orders, according to the California Department of Forestry and Fire Protection.

The world's largest tree has been wrapped in foil to protect it against flames from an out-of-control fire burning in California's scenic Sequoia National Park.The base of the General Sherman Tree has been wrapped in aluminum-based burn-resistant material, according to Sequoia and Kings National Parks.The tree is 275 feet tall, and over 36 feet in diameter at the base, making it taller than the Statue of Liberty from its base to the torch.The KNP Complex Fire, which is made up of The Paradise Fire and the Colony Fire, has charred 9,365 acres, so far. Lightning on Sept. 9 caused the initial fire and prompted Sequoia National Park to close its doors to visitors.Park crews are preparing the Giant Forest, which is home to over 2,000 sequoias, by removing fire fuel and wrapping the trees."Crews continue to apply protection wrapping (foil) to iconic sequoia trees and historic structures," according to Sequoia and Kings National Parks.Even though crews are hard at work trying to protect these sequoias, they have already been hit hard by wildfires in recent years. "Two-thirds of all giant sequoia grove acreage across the Sierra Nevada has burned in wildfires between 2015 and 2020," the National Park Service says.Sequoias that were killed during last year's Castle Fire could have ranged from hundreds to 3,000 years old, the service added.Officials sounded optimistic though, reporting minimal fire growth Thursday despite some activity picked up late in the afternoon as the temperature increased and humidity levels dropped.Giant sequoias aren't known to be the world's oldest trees, but "they are known to reach ages of up to 3,400 years," according to the National Park Service.And even though giant sequoias adapt to periodic fire, the bark usually protects the trees against significant damage and can insulate them against a fire's heat, NPS said. Over time, however, it may be difficult for the trees to heal after centuries of fire scars.