NYC nanny suspected of killing 2 children

(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.

PICTURES: Nanny suspected in fatal stabbings of 2 NYC kids

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.

Watch Terrell Brown's full report in the video above.