(CEDAR CITY)—A fatal accident involving at least 15 cars has shut down part of southbound Interstate 15 near Cedar City. The accident happened shortly before 1:00 p.m. near milepost 35 in northern Washington County. All southbound traffic must now exit the interstate in Cedar City on Exit 59 (200 North) and head westbound on S.R. 56 to Enterprise and then go southbound on S.R. 18 toward St. George. The road is expected to remain closed until 4:30 or 5:00 p.m.