Rising temperatures pose new challenges for firefighters who have made incremental progress against a massive wildfire in central California that has injured four people as it has become the biggest blaze in the state so far this year.

The Gifford Fire scorched more than 113 square miles of coastal Santa Barbara and San Luis Obispo counties, with 3% containment, according to a U.S. Forest Service.

Hundreds of remote homes are being threatened by a massive wildfire burning through Los Padres National Forest in central California.