Four people, including three members of a family, died in a fire in Chicago's Austin neighborhood early Thursday morning. The fourth victim was found Friday.

The fire, which killed three people, is considered to be suspicious. Evidence collected at the scene with the assistance of agents from the Bureau of Alcohol, Tobacco, Firearms and Explosives has been turned over to Chicago police detectives for a criminal investigation.

An arson investigation is now underway as authorities work to piece together what sparked a West Side fire that claimed the lives of four people, including a young child, early Thursday morning.