A state agency Friday suspended the license of the Levittown day care center where a 4-month-old boy died Thursday.

"We have suspended the license, pending our investigation, due to the serious nature of the incident," said Pat Cantiello, spokeswoman for the Office of Children and Family Services.

"Anytime there is a question of the safety and welfare of children, we take appropriate action," she said.

The Kay Shriver Inc. day care, located in a home in a residential neighborhood, was closed Friday. A handwritten sign on the door -- taped below paper pumpkin cutouts -- urged parents to call over the weekend for "information about next week."

Nassau County police are waiting for a medical report on the death, but a spokesman said Friday that it appears to be a "tragic accident."

Criminal charges are unlikely, said police spokesman Det. Vincent Garcia. Homicide investigators, however, won't rule out that possibility until after they review the medical examiner's findings.

Police said they responded to a call from the day care owner, Karen Shriver, shortly after noon Thursday. Emergency responders found the baby boy in a "cyanotic state," police said, referring to a discoloration of the skin.

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Shriver told police she performed cardiopulmonary resuscitation on the baby. The infant was taken to Nassau University Medical Center in East Meadow, where he was pronounced dead a short time later. The infant, from Syosset, has not been identified.

Police said Shriver told them she put the baby down to sleep at 11 a.m. Thursday and checked on him at noon. When she checked again, at 12:30 p.m., she said the baby showed signs of discoloration.

The license suspension took effect immediately, but Shriver can request an administrative hearing to contest the action in the next 10 days, Cantiello said. If the agency finds evidence of serious violations, the next step could be revocation of the center's license.

Shriver did not return calls seeking comment Friday.

The 14-year-old center at 74 Pond Lane has never had a license revocation or suspension, but it currently has two uncorrected violations from a July inspection for failing to run criminal and child-abuse background checks on an employee, records show.