PULASKI, Wis. – Four teenagers remained hospitalized with severe burns from a bonfire explosion at a midnight bonfire after high school football game. The teens were in burn trauma centers in Milwaukee and Madison. Sheriff Adam Bieber said some of the victims were in critical condition. The sheriff declined to offer a breakdown. Originally 17 students were hospitalized. The explosion was caused by a 55-gallon drum in the fire at a party out of the country. The drum was a quarter full of a mixture of gas and diesel fuel.