A wildfire in remote and rugged terrain along the Arizona-Mexico border grew to 4,470 acres by Monday morning.

The fire in the Coronado National Forest was 40 percent contained. No homes or buildings were threatened by the blaze, which is about 11 miles west of Nogales, said Heidi Schewel, a spokeswoman for the Coronado National Forest.

High winds caused the fire, first spotted on Friday, to grow over the weekend. Winds were lighter on Sunday.

Officials attributed the fire's latest growth to intentional fires that were used for building protection lines around the blaze.

Crews plan to continue building and maintaining the protection lines Monday. The fire was expected to be fully contained by Thursday.