Antonetti said that the attacker, who has not yet been publicly identified, then slashed her own wrist.

The victims and their assailant were rushed to a hospital, where one of the girls was listed in serious condition. Later in the morning, Antonetti said that child had been stabilized.

Authorities said during a morning news conference that police received a call about 3:45 a.m. at what police earlier described as a “private day-care in a home” in Flushing, a neighborhood in Queens.

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Upon arrival, responding officers found “several” people who had been stabbed, including the three children, who range in age from 3 days old to 1 month old, authorities said. Police did not elaborate on the children’s injuries but said that the adult female victim sustained “multiple stab wounds” to her torso and that the adult male victim was stabbed in the leg.

There were several other children at the day-care center who were not injured in the attack, police said.

Authorities said the attacker had a slash wound to her left wrist, which was believed to be self-inflicted.

Police have not yet determined a motive.