The incident was reported at Grace Lutheran Church and School in the 400 block of Hempstead Avenue around 1 p.m. last Friday.
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Authorities say the girl was unresponsive and she wasn't breathing. She was transported from the facility in critical condition.
She was later pronounced dead by hospital staff on Monday.
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There is no word on the child's cause of death.
The investigation is ongoing but officials released the following statement Tuesday:
"The Nassau County Police Department and the Medical Examiners Office is currently looking into possible medical conditions as a contributing factor."
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