CHILOQUIN, Ore. (AP) — A fast-growing wildfire on national forestland in south-central Oregon has prompted mandatory evacuations as it threatened about 3,000 homes, authorities said.

Pushed by strong winds, the fire in Klamath County grew from about 26 square miles (65 square kilometers) Thursday to 61 square miles (158 square kilometers) Friday in the Fremont-Winema National Forest and on private land. There was no containment, according to the update posted on Facebook by the incident management team.

Klamath County Emergency Management issued an immediate evacuation order Friday for people in certain areas north of Beatty and near Sprague River.

Fire officials said less than a quarter of the 3,000 homes under threat are under the mandatory evacuation orders. Most of those residents have been told to be ready to leave at a moment’s notice, KOIN-TV reported.

Additional resources, including two teams from California, were being sent to help fight the blaze.

The Fremont-Winema National Forest was partially closed Friday, and smoke was causing visibility issues for motorists in the town of Chiloquin and surrounding areas.

Evacuation orders remain in place from a smaller fire about 40 miles (64 kilometers) east of Roseburg that was slowly growing, officials said. Forest service campgrounds were also under mandatory evacuations, including Apple Creek, Horseshoe Bend and Eagle Rock.

That fire had burned about 9 square miles (23 square kilometers) as of Friday with no containment.