About 100 visitors were evacuated on Sunday as a wildfire inside Yosemite National Park in Northern California spread to at least 700 acres. The wildfire, which started weeks ago and had been controlled by firefighters, was reignited Sunday afternoon due to strong winds and high temperatures.

The people evacuated from the park reportedly included hikers who had climbed the iconic Half Dome peak, rising about 5,000 feet above the Yosemite valley. The U.S. National Park System said in a statement that several helicopters, air tankers and hotshot crews have been assigned to attend to the wildfire. However, the rugged terrain has been reportedly hampering the work of the firefighters, Kari Cobb, a spokesperson for the park, reportedly said.

“We actually had a number of helicopters here in the park that were able to airlift these individuals back to Yosemite Valley so that they could be out of the way of the fire,” Cobb told ABC News.

Officials reportedly said that there were no reports of injuries or structural damages from the flames, even as smoke from the wildfire could be seen rising above the park. Although the park reportedly remained open, some of the trails near Half Dome, Merced Lake and nearby camps remained closed on Sunday. Cobb also reportedly said that all roads leading into the valley remain open.

"We just got unbelievable crazy winds and unexpected hot conditions," Tim Ludington, the park's chief of roads and trails, told the Fresno Bee, a local newspaper. "The fire behavior totally changed."

The wildfire, which reportedly began July 20 between Little Yosemite Valley and Half Dome, was sparked by lightning, and is expected to keep growing, Ludington reportedly said.

The Sunday fire reportedly comes two days after firefighters battled to contain another fire about 15 miles southwest of Yosemite called the Bridge Fire, which began on Sept. 5 and spread across 300 acres. The blaze was 70 percent contained and an evacuation order for 300 homes most threatened by the fire was lifted, the California Department of Forestry and Fire Protection said, according to The Associated Press.

Here are some photos of the wildfire posted by users on social media.