The motive in the attack was unclear, police spokesman Lt. Thomas Antonetti said Friday.
Police say five people, including three infants, were stabbed at an overnight day care centre in New York City.
A sixth person was found in the basement of the day care center in the Flushing neighborhood.
One of the infants, a girl, is in serious condition, but none of the injuries is considered life-threatening. Two girls and a boy of unknown ages were cut or slashed just before 4:00 AM local time Friday morning along with an adult male and female.
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Her identity has not been released.
The suspect also stabbed a man in the leg, who is thought to be a father of one of the children at the daycare, but it wasn't clear if one of his children was stabbed.
Other children at the day care weren't injured, authorities said.
A 52-year-old woman working at the center has been arrested after the 3:30 am assault in the Queens borough of the city. Her relationship with the children wasn't immediately clear.