BAKERSFIELD (AP) -- Federal fire officials accelerated their attack Sunday on a smoky wildfire that threatened 500 homes in Central California as they raced to control the fast-moving blaze before hotter, drier weather sets in, a U.S. Forest Service spokeswoman said.

The fire burning in and around the Sequoia National Forest doubled in size overnight and came within a mile of a community about 30 miles northeast of Bakersfield where sheriff's deputies walked the streets with bullhorns and knocked on doors as they urged residents to evacuate, authorities said.

The Forest Service reported that the Shirley Fire had consumed more than 2.8 square miles of trees, grass and chaparral located on federal, state, local and private lands.

The blaze, first reported Friday night, was 10 percent contained.

The cause is under investigation.