Fire Battalion Chief Bob Knoll says the fire that broke out about 1:30 p.m. Wednesday sent a mother and son to the hospital.
Knoll says seven people in a second-story apartment near Idlewild Park escaped unhurt. He says a dog also escaped but two kittens died. A third cat is missing.
Knoll says the son suffered a cut and the mother had cardiac symptoms so they were taken to Renown Medical Center.
An investigation is under way but Knoll suspects a propane leak when the son was cooking on a gas grill.
A total of more than a dozen people were evacuated from the building but most hoped to be back home Wednesday night.