It happened around 7:30 p.m. on the 2400 block of Benson Street, right off Roosevelt Blvd., in the Rhawnhurst section of Philadephia.
Chopper 6 was overhead as emergency crews brought some residents out on stretchers to be evaluated.
Philadelphia apartment evacuated due to high carbon monoxide levels
No serious injuries were reported.
Residents were able to return just before 9 p.m.
Further details on the incident were not immediately released.