As reported by the Louisville Courier Journal:

Four horse barns at the fairgrounds in Louisville were destroyed in an early morning fire Tuesday that damaged four other barns, a spokesman for Louisville Fire & Rescue said.

There were no horses in any of the barns and no injuries were reported, Sgt. Salvadore Melendez said, noting that firefighters were thankful that the three-alarm blaze did not occur during the Kentucky State Fair, which ended Sunday.

The fire was reported at 2:08 a.m., and the first unit arrived at 2:13 a.m., Melendez said, adding that the blaze was under control shortly before 3 a.m.

Four barns were "completely lost" and a fifth was heavily damaged, he said. The other three sustained minor damage, he said.

There was "heavy initial fire" when crews arrived and "the wind played a factor" in fighting the blaze, Melendez said.

"Despite that, because of the resources used ... firefighters did an excellent job preventing it from spreading," he said, noting that 66 firefighters were called to the scene.

The horse barns are close to Interstate 65, and plumes of smoke spread across the highway during the fire. But the interstate remained open, a MetroSafe Communications supervisor said.

Melendez said arson investigators were at the scene attempting to determine the cause of the fire.

Update: It looks as though Barns H, I, J, and T were the barns completely levelled by the fire. Here is a link to the story with video from WLKY Louisville: http://www.wlky.com/news/20661151/detail.html.

Update: The Louisville Courier-Journal has a large photo gallery from the fire and aftermath in their coverage here.