Four people have been displaced after a duplex fire in Janesville on Tuesday afternoon. A news release said firefighters were sent to 828 Benton Ave. at 3:35 p.m. in response to a residential fire. Dispatchers had reported flames and smoke that were visible from the back of the building. Officials said the first and second floors of the residence had fires in the interior that extended to the attic. Firefighters confirmed all four occupants had safely evacuated. The release said multiple hose lines were used to quickly stop the fire from spreading. Crews were on scene for roughly three hours to make sure the fire was under control.