Firefighter units from South Pasadena, Alhambra and Pasadena were called to a single-story residence at Diamond Avenue and Monterey Road shortly after 6 a.m. on Tuesday morning after reports of smoke at the rear of the structure. South Pasadena Fire Department officials made the initial entry and searched awhile before locating the origin the fire. “It appears to be a smoldering fire in one of the rear bedrooms,” said Mario Rueda, fire chief for the South Pasadena Fire Department. “We are assessing the exact cause of the fire, trying to get all the smoke out of there. There’s pretty heavy smoke and difficult to see and so it presented some dificulty for the firefighters.” Rueda said smoke alarms went off inside of the home “which saved lives.” One woman was treated for smoke inhalation but was later released. A portion of Monterey Road was closed to traffic while the investigation was underway.