A source close to the investigation said the call came into 911 from a family member, who said the children's mother "snapped" and stabbed the children before starting the fire.

A 4-year-old boy died after a woman allegedly stabbed multiple people inside a Logan Square residence before setting the home on fire Friday morning, police said.

Three children were found stabbed in a burning building in Chicago’s Logan Square neighborhood on the Fourth of July, sources told NBC Chicago