Lucia, her 2-year-old brother Leo Krim were stabbed multiple times. Police believe their nanny is the killer.
(CBS News) -- Police in New York City are investigating a horrific double murder in a wealthy neighborhood. The victims are two small children and their nanny is the suspect.
Marina Krim returned home to her luxury New York City apartment Thursday night to find two of her children brutally stabbed to death and lying in a bathtub. The children's nanny lay nearby with an apparently self-inflicted knife wound to the throat.
"It's unbelievable, unbelievable, I can't imagine what the mother is feeling," neighbor Charles Zimmerman said.
Lucia, 6, and her 2-year-old brother Leo had been stabbed multiple times.
Neighbors described "blood-curdling screams" coming from both the mother and building superintendent when they found the bodies. New York Police Department Deputy Police Commissioner Paul Browne said, "Her screams were heard by a neighbor who alerted police and who arrived and found the children dead."
Marina Krim -- seen at the scene being led to an ambulance covered by a bed sheet -- had earlier taken her 3-year-old, Nessie, to a swimming lesson - leaving Lucia and Leo with 50-year-old nanny Yoselyn Ortega.
Police met Kevin Krim, a CNBC digital media executive who had been away on a business trip, with the grim news as he arrived at the airport. He was taken to his wife and surviving child's side at a New York hospital.
Maria Hirschhorn, a neighborhood resident, said, "All I can say is God be with that mother, you know, give her peace."
Neighbors said Marina Krim was a devoted mother who had a close relationship with the nanny, having recently spent a vacation at Ortega's family home in the Dominican Republic.
According to published reports, Ortega is in critical, but stable condition, and has yet to be charged with a crime.