The child's mother said he was last seen with her friend leaving their apartment on East 189th Street around 7 p.m.
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That friend had permission to take him for a walk, but they never returned home.
Further investigation revealed they boarded a BX41 MTA bus at Fordham Road and Webster Avenue just before 7:30 p.m.
They had not been seen or heard from since, prompting police to put out an alert.
The circumstances surrounding the incident were not yet known.
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