Chicago, IL - Investigators continue to look for answers after a weekend fire kills seven people at a suburban Chicago home.

Firefighters haven't publicly speculated about a possible cause yet. Those who died include a 3-day-old baby and a 3-year-old boy. The Cicero Assistant Fire Marshal says investigators believe the blaze started in the back of the home, but he adds nothing has been ruled out.

A grandfather had planned to spend his weekend with his family celebrating his birthday and the arrival of a new grandson. Instead, he was left mourning the loss of three children, two grandchildren, and two friends.