More than 22,000 firefighters were up against "extreme fire behavior" across the West on Sunday as homes burned and thousands of residents fled fast-spreading flames. The Dixie Fire in Northern California and the Bootleg Fire in southern Oregon were the most ravenous among at least 88 major wildfires raging across 13 states. Firefighters were struggling with rugged terrain in hot, dry conditions, the National Interagency Fire Center said. 📸:Josh Edelson, @GettyImages; Noah Berger, @APNews T Don't expect the wildfire threat to ease any time soon, authorities say. On Sunday, more than 2,200 firefighters were struggling to contain the Bootleg Fire, 640 square miles of devastation ranking as the state's third largest fire in more than 100 years. More than 70 homes already have burned, and thousands more are threatened. Fire trucks and other resources were coming in from Arkansas, Nevada, Alaska and elsewhere.