A missing child investigation took a harrowing turn in Brooklyn this week when a police dog detected human blood near a refrigerator in the kid’s family apartment, law enforcement sources said.

The 11-year-old autistic boy was reported missing from the unit on Howard Avenue near Sutter Avenue in Brownsville, prompting ACS to conduct a wellness check on Sept. 25, sources said.

The boy’s mom, who opened the door, did not hand over her son’s birth certificate, but was otherwise cooperative, according to the sources.

Cops investigated the apartment of a missing boy’s family, where a police dog detected human blood. Kyle Mazza/Shutterstock

But the boy was not found in the home and the investigation is ongoing, police said. Kyle Mazza/Shutterstock

The case workers searched the home but fo

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