The child "escaped his mother's watchful eye" and left his home, according to the Naperville Police Department's Facebook page.
In a video of the pulse-pounding rescue, Mannino is seen jumping out of his vehicle to get the child.
CBS 2, a Chicago television station, spoke with the officer. "Mom was in the house with the kid, and in a fleeting second, child ran out of the house".
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L'homme a ensuite pris deux ou trois personnes en otages, poursuit la préfecture de police. Un homme retenu par le forcené avait réussi à se sauver avant l'intervention de la police.
Police in IL released video showing the moment an officer stopped to save a young boy he saw running on the side of a busy road.
"We attribute that to Sgt. Mannino's observation while on patrol and quick reaction, placing his squad vehicle and himself between the child and traffic", said the department on Facebook.
The child wasn't injured. No charges were sought in the case.
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"I initially thought it was a dog at-large about to run into the street", Mannino said. Sgt. Mannino quickly caught up to the boy and pulled him out of harm's way.
Mannino received the Life-Saving Award on June 7 in recognition of his actions.
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Le cours, très fluctuant, se situait lundi autour de 6.750 dollars vers 07H30 GMT contre 7.646,27 dollars vendredi soir. Vendredi vers 21 h GMT (23h au Luxembourg), le bitcoin valait 7646,27 dollars.