Fire swept through a crowded mobile home in a rural area near here, killing six children age 10 and under, authorities say.

Five other children and an adult escaped the fire early Sunday, authorities said."This is the worst fire we can recall in Sumter County," Fire Chief Larry Causey said Monday. "It's saddening to think something like this can happen."

Causey said 11 children and an adult were in the doublewide trailer when the blaze started about 3:45 a.m. Sunday. Willie English, the grandfather of 10 of the 11 children, escaped along with children ranging in age from 5 to 15.

The cause of the fire hasn't been determined.