The Forsyth Fire started Thursday in the Pine Valley Mountains and has already burned about 2.3 square miles (5.96 square kilometers), said Karl Hunt, a spokesperson for the Utah Division of Forestry, Fire & State Lands. It has forced people to evacuate from the Pine Valley Community and nearby campgrounds, although the number of people who have fled was not immediately clear.

The blaze, which is about 15 miles (24.1 kilometers) northeast of St. George and includes steep, mountainous terrain, has also threatened 400 structures.

By Friday evening, the fire remained uncontained despite 150 people battling the blaze, including two hotshot crews from Utah and Nevada, according to Hunt. Teams were using helicopters, more than a dozen engines and water tenders.

The cause of the fire has not been determined and is under investigation, Hunt said.

He urged the public to stay away, saying: “Let the firefighters do what they do best and try to get this fire under control.”

There has been a red flag warning in the area since Thursday because of high wind gusts, low humidity and high temperatures.

Hunt said the blaze came fairly early in the year, following a drought declaration by Utah’s governor.

“So the fuel is drier this year as well. And so if you combine the drier fuel with the high winds and it’s ripe for a wildfire,” he said. “Kind of like the perfect storm.”

There have been no injuries or deaths, according to Hunt.

Utah Gov. Spencer Cox said on the social media site X that they are closely monitoring the fire and urged the public to follow local officials’ instructions.

“If you’re in the area, please evacuate immediately,” he said. “First responders are doing heroic work, but they need your cooperation to save lives.”