Excerpts from nbcchicago.com:

Authorities investigating an explosion and fire last week at a home in Northbrook have found no evidence the blaze was intentionally set or to indicate it was suspicious in nature, but the cause remains undetermined.

Fire Chief Andy Carlson said the cause of the blaze remained under investigation, and the Illinois State Fire Marshal’s office will continue to investigate plus experts will be sent out by the insurance company that covers the home and they are expected to look at the home’s appliances, including the furnace.