NEW : 39 people have been injured , 3 of them critically . NEW : 80,000 people typically fill the county during the Fourth of July weekend . The shooting happened at a country music festival in Las Vegas on Sunday night when an armed man opened fire from his hotel room onto 22,000 concertgoers. Burnett County 's typical population is about 17,000 . Grantsburg , Washburn , Danbury and Web Lake were among the hardest hit .
NEW : 39 people have been injured , 3 of them critically . NEW : 80,000 people typically fill the county during the Fourth of July weekend . NEW : Burnett County 's typical population is about 17,000 . Grantsburg , Washburn , Danbury and Web Lake were among the hardest hit .