LEXINGTON, Ky. (FOX 56/WKYT) – Lexington firefighters are investigating what caused a large fire at a business Friday morning.

They said they were called to a building that contains Big Bob’s Used Furniture on North Limestone around 7 a.m. When they arrived, firefighters said they saw heavy flames coming from the building. Firefighters then called a second alarm.

Just after 8 a.m., firefighters said the fire was deemed to be under control. However, they say part of the building is not structurally stable, and debris is making it difficult for firefighters to get inside the building.

No injuries have been reported in the fire. As of 9 a.m., many fire crews were still on the scene, and investigators were still trying to determine what caused the fire.