Chicago police did not release additional details, but said their investigation is ongoing.
CPD said the alleged abduction took place in the 1300-block of South Damen Avenue in the Illinois Medical District just before 4:20 p.m.
Chicago police said the 7-year-old was grabbed by his mother, who was armed with a gun, and taken to an unknown location.
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The boy's mother isn't his legal guardian. At the time, Chicago police said she should be considered armed dangerous.
This is a breaking news story. Check back for updates.