SPRINGFIELD, Ill. (WCIA) — Springfield Fire Department crews put out a fire Sunday morning at a Dollar General store.

It happened before 10 a.m. on Wabash Avenue near Corbin Street.

Springfield Firefighters Local 37 says on Facebook says Engine 9 crews found a fire inside the building and have knocked it down.

Battalion Chief Gary Self says there was a small fire in one of the refrigeration units at the front. He says crews found flames showing through the front of the window when they got there.

The chief says firefighters extinguished it with very little damage to the building. He adds the fire put out a lot of smoke.

Self says there were three employees inside, along with two customers.

“The employees did a good job of getting the customers out,” he says.

A mobile ventilation unit was brought to the scene. The fire union says it’s a large fan that’s mounted on a truck to help air out large buildings.

Investigators say they’re still working to learn what started the fire.

This story has been updated.