Three fire victims were graduates of J.L . Mann High School in Greenville . The school district said it was working with the state and federal authorities to determine what caused the fire. One survivor jumped out of a third-story window into a canal to escape .
Three fire victims were graduates of J.L . Mann High School in Greenville . `` Heartbroken '' house owner 's daughter among six survivors hospitalized . One survivor jumped out of a third-story window into a canal to escape .