Lehigh County Coroner Scott Grim says that the victims ranged in age from a 4-month-old boy to a 79-year-old man. Investigators Thursday were sifting through the remains of two leveled rowhouses.
Earlier, authorities had said three people were killed and two were unaccounted for.
Police Chief Roger MacClean says a couple in their 70s lived in a two-story row house that blew up about 10:45 p.m. Wednesday.
Michelle Hall told The Morning Call newspaper that her in-laws, 74-year-old Beatrice Hall and 79-year-old William, lived in the home.