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"Building works had been carried out and the nursery school had been closed. It then opened again, although it clearly was not finished.
"Walls had been painted and new flooring laid, and the nursery school had to be closed."
But Jan Pasternak, from the Integration and Education Department in the City of Frankfurt, said: "We are not aware of any building works being carried out at the nursery school and certainly not aware of cables coming out of the walls. This would not be possible when the nursery school is open as normal for business."
The Public Prosecutor in Frankfurt is investigating charges of involuntary manslaughter against unknown persons at this time.
Prosecutor Nadja Niesen: "The focus of the investigation is on whether someone acted against their duty of care."
The mum is now trying to raise enough money to fly Antonio's body to Italy for burial and the parents association has set up a PayPal for donations.
The nursery school remains closed while investigations are ongoing.