BROWNSVILLE, Brooklyn (WABC) -- A disturbing investigation is underway in Brooklyn into a possibly missing 11-year-old boy who has never attended public school.

While the child's mother denies the boy is in her apartment located at 614 Howard Ave. in Brownsville, the NYPD says a K-9 cadaver dog got a hit on the refrigerator for human blood.

Investigators are now waiting for a search warrant to more thoroughly examine the home.

Officials say that when ACS was initially called to the apartment on reports of child abuse, they say the mother denied even having a child. However, ACS has recovered a birth certificate with the woman as the listed mother.

"The safety and well-being of New York City's children is our top priority. As soon as this family came to our attention, we launched an in

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