Offshore winds fanned a large wildfire burning early on Sunday in the Los Padres National Forest in California, prompting voluntary evacuations for portions of Fillmore and a cluster of homes along a highway connecting Santa Paula and Ojai.
Since Saturday afternoon, winds have pushed the Day Fire about 16 kilometres (10 miles) west and burned several thousand new acres, authorities said.
It has charred an area of more than 323 square kilometres (125 square miles) and was 15 percent contained.
The fire was threatening northwest Fillmore - a city of about 14,000 people, 95 kilometres (60 miles) northwest of Los Angeles.
Mandatory evacuations have yet to be issued.
Winds out of the north and northwest were expected at up to 40 kilometres per hour (25 miles per hour) on Sunday, with stronger gusts below passes and canyons, according to the National Weather Service.
More than 1,700 firefighters were assigned to the blaze, which began nearly two weeks ago.