ROCK SPRINGS, Wyo. (AP) — Firefighters are making good progress on a wildfire burning south of Rock Springs in southwest Wyoming.

On Thursday, firefighters increase containment of the fire burning on federal, state and private land to 72 percent.

The Bureau of Land Management says the fire has burned about 21 square miles (54 square kilometers) since it started last weekend by lightning.

The fire is burning grass, sagebrush and Juniper. No structures have been lost.