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.

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.

A fast-moving wildfire erupted several miles north of the U.S.-Mexico border in the San Diego area, blackening thousands of open acres as ground and airborne crews worked Friday to quell the flames amid arid and blustery Santa Ana conditions.