A nearly 40,000-acre wildfire forced people from their homes in two Southern California counties over the weekend as firefighters worked to contain the blaze in challenging terrain.

Fire managers for the U.S. Forest Service put Gifford at 49,761 acres (77 square miles), with 3% containment. Three people were reported injured: a civilian who was burned, and two contractors who were injured in an off-road utility vehicle’s rollover.

The Gifford fire has rapidly spread after firefighters contained the Madre fire. Together, the two blazes have already burned over 100,000 acres.