A fire broke out at Marcello's Deli and Catering in Danbury shortly before midnight on Monday night.
Dispatchers received multiple calls for smoke coming from a structure near Lake Avenue and Hobson Street. Dispatchers alerted firefighters who quickly arrived on scene.
When crews arrived, firefighters said they found a large volume of smoke coming from the roof of the business.
Fire officials said crews worked to put out a stubborn fire in the attic space of the business. According to Danbury Fire Department, the fire eventually became a third alarm fire. Additional personnel and mutual aid from Bethel, Brookfield and Ridgefield Fire Departments, along with Danbury Police, Danbury Hospital EMS and Danbury Emergency Management responded to the scene.