MILFORD, Conn., Aug. 7 (UPI) -- Authorities in Milford, Conn., said firefighters seeking the origins of smoke emanating from a home discovered an altered closet filled with marijuana plants.

Police said four residents of the home -- identified as Leslie Defrancesco, 29, Ethan Mayo, 33, James Leclair, 33 and Michael Mikiens, 32 -- were arrested after officers seized 40 grams of marijuana, a ventilation system, heat lamps, fans and paraphernalia used to smoke the plant from the house, The Hartford Courant reported Thursday.

Acting Fire Capt. Christopher Zak said firefighters arrived on the scene after a heat lamp caused burlap netting covering the marijuana plants to ignite. He said the fire had burned out before firefighters arrived, but they discovered the closet during a search of the home.

All four suspects were charged with operating a drug factory, cultivation of a controlled substance, possession of drug paraphernalia and conspiracy. Leclair and Mikiens were also charged with possession of marijuana and possession of marijuana within 1,500 feet of public housing.

The suspects were released and are scheduled to appear in court Aug. 26.