Investigators have released a cause in Thursday's deadly fire in southwest Philadelphia. The fire marshal said it was a child playing with matches. Kathy White, 36, and her three children were killed. Firefighters believe the family tried to fight the fire instead of immediately getting out. Firefighters also said there were no smoke detectors in the house.

Previous Stories:

• December 8, 2006: 3 Children, 1 Adult Die In Southwest Philly Row Home Fire