Two children who appeared to have frozen to death while living in a van in Detroit last month actually died of carbon monoxide poisoning, officials said.

The cause of death of two young children who were sleeping in their family's van was revealed to be carbon monoxide poisoning and not exposure to the cold as Detroit authorities first thought.

Feb. 10, Tateona Williams and her family, who were experiencing homelessness, were inside their van at Detroit's Greektown Casino. Inside were her five children. Williams first discovered one of her kids was not breathing that morning.