(KGNS) - Firefighters and sheriff's deputies are investigating after a grass fire spread and destroyed a ranch house off Interstate 35 in northern Webb County on Tuesday, Sept. 29.

Emergency crews initially responded around 2 p.m. Tuesday to a grass fire on Callahan Ranch, located near mile marker 35. When firefighters arrived, flames had already spread to a home on the property.

While crews brought the blaze under control, the structure burned to the ground.