The fire happened on Boy Scout Road in South Huntingdon Township, Westmoreland County.
The fire broke out at a large structure in the 200 block of Boy Scout Road around 11 a.m.
Sky 4 flew over the scene Friday afternoon where flames and smoke could still be seen.
It was not immediately clear if anyone had been injured in the fire.
This is a developing story. Stay with Pittsburgh’s Action News 4 for updates.