Firefighters on Sunday continued working to contain the Brian Head Fireâs northern flank and to mop up areas on the southern flank where heat still existed. As of Sunday morning, the blaze â which was sparked by a weed-burning effort on private land â remained at 71,571 acres and was 80 percent contained, according to fire authorities. Helping to attack the southern Utah fire were 787 firefighters, five helicopters, 34 engines and four bulldozers.