At first, crews thought the person living in the first floor apartment was home and conducted an extensive search and rescue operation. However, they later determined the person was not home and a passerby had called 911, according to a press release.
The fire caused extensive damage, crews said. They are still investigating the cause.
Crews from the Appleton Fire Department and Grand Chute Fire Department helped put out the flames. Appleton Police, Gold Cross Ambulance, Outagamie County CERT and WE Energies also responded to the fire.