Aberdeen Fire & Rescue units responded to the complex at the Brown County Fairgrounds around 8:45 p.m.

A fire started after cardboard materials came into contact with electrical equipment, according to Aberdeen Fire and Rescue Battalion Chief JR Huebner.

“For us, it was just a small fire that the crews were able to put out with a water fire extinguisher,” he said.

“There was a lot of smoke throughout the Expo Building, so we just spent some time airing that out and ventilating that out with some fans,” Huebner said.

Three Aberdeen Fire & Rescue trucks, two ambulances and a couple units from the Aberdeen Rural Fire Department responded. Several vehicles with onlookers were also on the scene.

Nobody was injured. The incident is still under investigation.