The Waterloo Fire Department and Waterloo Police Department responded shortly before 11 a.m. Friday to a fire inside Mill Street Laundromat, 227 W. Mill Street.

The fire was contained to one of the dryers inside the laundromat, but heavy smoke was seen outside the building for a short time. An arriving police officer was able to knock down the fire with an extinguisher.

Firefighters remained on scene to ventilate the building.