Kankakee police say arson caused a fire last week that critically injured two children who later died.
In a statement released Monday, police said investigators have "developed information on a person, who after being interviewed, is suspected of starting the fire at the apartment building."
Authorities say investigators are interviewing the suspect and collect evidence. They add they expect the Kankakee County State's Attorney's office to file formal charges in "the near future."
Killed by the fire were 2-year-old Jushaun Watson, who was pronounced dead on Sunday at Loyola University Medical Center in Maywood, and 4-year-old Justice Stewart, who died Friday at Comer Children's Hospital in Chicago.
A 65-year-old woman suffered smoke inhalation, a 25-year-old man and a 22-year-old woman suffered burns on their hands. Twenty were left homeless.