MARIPOSA, Calif. (AP) – Firefighters are battling a small wildfire that sparked the evacuation of rural homes outside of Yosemite National Park.

The California Department of Forestry and Fire Prevention says the blaze broke out near a road south of Mariposa on Sunday afternoon and burned at least 15 acres.

Agency spokeswoman Lynette Round says firefighters contained 20 percent of the blaze.

The blaze is threatening an unknown number of homes in the area, which is about 15 miles west of the park.

Mariposa County Sheriff’s deputies evacuated residents in the area. A call to the department’s spokesperson has not been returned.

The cause of the fire is under investigation.

Copyright 2015 The Associated Press.