The mother arrived home Thursday evening with her 3-year-old to find the 1- and 6-year-old children in the apartment at a building called La Rochelleon on Manhattan's Upper West Side. It's unclear how many times the children were stabbed.
Police say the nanny was on the floor of the bathroom and had stab wounds believed to be self-inflicted. They say a kitchen knife was nearby.
The mother called 911.
Police say the nanny is in custody. She's hospitalized in critical condition.
The New York Police Department is investigating.