Fire crews say it could take days to determine what caused a fire at a vacant building in Nicholasville overnight.
Fire officials say the flames were so intense when they arrived on the scene Saturday morning, that they had to stay for hours to put it out.
They haven't ruled out arson as a cause of the fire.
The building had been condemned before the fire broke out.
Crews remained on scene just in case hot spots were to ignite, well into the evening.