The Brooklyn mom who eerily told cops her missing 11-year-old non-verbal autistic son never existed is now being held on Rikers Island, law enforcement sources said Monday.

The boy – identified by cops as Jacob Pritchett – was nowhere to be found when child welfare officials, and later police, swept the Howard Avenue home in late September and early October, the sources said.

Now, his 53-year-old mom – who is not officially being identified by police – is being held on Rikers Island on a Brooklyn Family Court warrant for failure to produce the child, the sources said. 3

She allegedly flew into a rage during an Oct. 1 NYPD visit and claimed she lived alone with no children, according to the sources.

NYPD detectives ultimately brought a K9 dog into the apartment, which detected t

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