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FLUSHING, Queens — Three infants, all one month or younger, were stabbed in an unlicensed birthing center in Queens early Friday, police said.

Police investigate a quadruple stabbing on Sept. 21, 2018, that included three infant victims. (PIX11)

Authorities were called at about 3:40 a.m. to a residence believed to be serving as a birthing center — that was advertised as a day-care center, on 161st Street between 45th and 43rd avenues in Flushing.

According to police, adults upstairs heard screaming from below. They came downstairs and saw a 52-year-old woman stabbing three female infants with a butcher knife and a meat cleaver.

Police sources identified the woman as Yu Fen Wang. She worked at the facility, according to the Queens District Attorney’s Office.

A 1-month-old and a 13-day-old baby were stabbed in the stomach, and a 22-day-old was stabbed in the ear, chin and mouth, officials said.

The 31-year-old father of one of the children tried to intervene and was stabbed in the leg, according to officials.

Wang also stabbed a 63-year-old female co-worker eight times, officials told PIX11.

All victims were taken to the hospital. The three infants are listed in critical condition, police said.

“I don’t want to hear that,” neighbor Kia Xiao said. “I wish the three kids recover soon.”

It is not known what led to the attack.

According to authorities, there were nine children and their parents at the location during the time of the incident. Sources believe the 13-day-old and month-old infants were born at the facility.

Police arrived and discovered Wang in the basement kitchen floor unconscious.  She had caused a wound that appeared to be self inflicted on her wrist, and was taken into a custody for a psychiatric evaluation, authorities said.

Both the butcher knife and the meat cleaver were recovered by police.

Authorities give an update on the stabbing:

Clarification: Police initially gave different ages for the youngest two victims. The story has been updated with information provided by the Queens District Attorney’s Office.