The discovery was made about 4:30 a.m. in the city's southwest area, WPVI-TV, Philadelphia, reported.
Police said it appeared to be a case of murder and arson, the TV station said.
No arrests had been made and an autopsy was to be performed to determine the cause of death.
Rosie O'Donnell unveils nearly 50-pound weight loss
Members of Congress to keep receiving porn magazine