Tulsa, Okla. — A horse barn is fully involved in flames when firefighters arrive near 3600 North Harvard Avenue. They were able to quickly get the fire out but the structure had been destroyed. No animals were harmed in the fire but there were horses running free on the property. Tulsa firefighters arrived on the scene. No structures around the barn were affected by the fire. There were no utilities connected to the barn, so investigators are not sure why the barn caught on fire around 12:30 a.m. Tuesday.