Rising temperatures on Thursday posed more challenges for firefighters who have made incremental progress against a massive wildfire in central California that injured four people as it became the biggest blaze in the state so far this year.

The fire has scorched at least 131 square miles of Santa Barbara and San Luis Obispo counties, with just 9% containment.

The Gifford Fire, a wildfire burning in Central California that has destroyed over 83,000 acres in six days, continues to rage and is now the largest blaze in the state this year, according to Cal Fire.