Waterloo Fire Department responded Thursday afternoon just before 4:30 p.m. for a report of smoke at Yo-Toppings, 624 N. Market Street in Waterloo.

Fire personnel opened the front entrance and used a fan for ventilation and then climbed to the roof of the business to determine the cause of the smoke.

Yo-Toppings posted on its Facebook page that they were back open Thursday evening.

Waterloo Fire Chief Aaron Shive said a belt on one of the frozen yogurt machines got out of alignment and was smoking, which led to the fire call.