Phelps County firefighters say they responded to a fully involved residential structure fire Saturday morning, where units initiated defensive operations due to the heavy fire conditions.

The Doolittle Fire Protection District assisted Rolla Rural Fire Protection District with the two-story structure fire at 3:04 a.m. on South U.S. Highway 63 near County Road 5340.

Rolla Rural Fire Protection District said when firefighters arrived at the location, they found the structure had already collapsed. Firefighters determined that the residence was vacant and reported that the vacant home was a "total loss." 

The cause of the fire has been classified as undetermined, the Rolla Rural Fire Protection District said on Saturday.

"This shows the teamwork involved between our local departments to provide the public with professional and immediate services,” Rolla Rural Fire Protection District said. " While Rolla rural does have paid firefighters on duty, the majority of the department is volunteer along with the adjoining departments who responded without hesitation."

Rolla rural fire said assistance from the Edgar Springs Rural Fire Protection District and St. James Fire Protection District with water supply operations was canceled when firefighters determined they had sufficient water supply for fire suppression.