An evacuation order is in effect Tuesday for Otay Mountain-area neighborhoods as crews worked to contain the smoldering remnants of a wildfire that scorched about 10 square miles of remote terrain in the far southern reaches of the San Diego area over the last five days.

The fire that broke out near the U.S.-Mexico border was 10% contained as of Friday morning. It was one of several wildfires that started Thursday.

Authorities issued evacuation orders and warnings to nearby areas early Friday morning as a wildfire in the Otay Wilderness Area exploded to 4,250 acres in rugged terrain overnight. Crews were able to get 10% of it contained.