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CHICAGO (AP) — Federal agents have joined Chicago police and fire investigators in trying to determine the cause of a suspicious fire that killed four, including three children.
The Cook County medical examiner's office said Wednesday the youngest victim, 3-month-old Melanie Watson, died of injuries suffered when her father leaped with her from their burning third-floor apartment. Her death was ruled a homicide.
Officials say the autopsies of the two other children, ages 7 and 4, are complete but results are being withheld pending formal identification.
The death of the fourth victim, 56-year-old Kirk Johnson, was also ruled a homicide.
Officials say Bureau of Alcohol, Tobacco, Firearms and Explosives agents joined the investigation after findings thought to pinpoint the cause of the blaze were inconclusive.
Chicago police say they're questioning a person of interest.
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