The 17-year-old punk accused of fatally mowing down two New Jersey girls was initially detained shortly after the crash — but was released to his ex-cop father eight hours later, police records reveal — leaving their grieving families with “very serious concerns.”

Vincent Battiloro is facing first-degree murder charges in juvenile court, but a lawyer for one of the victims’ families told The Post the computer-aided dispatch (CAD) reports released by officials this week open up a stream of new questions.

“Why this juvenile was released to his father after all that occurred,” said attorney Brent Bramnick, who is representing the family of victim Maria Niotis.

“They’re very upset that he was detained, released and then rearrested,” Bramnick added in reference to the family. “They want to

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