Police are searching the US home of a nanny suspected of murdering two children in her care.
Yoselyn Ortega remains in a critical condition in hospital after apparently slitting her own throat, moments after stabbing Leo Krim and his sister, six-year-old Lucia.
Police are investigating whether Ortega had sought psychiatric support in the weeks leading up to the tragedy.
Leo and Lucia were found by their distraught mother, Marina, dying of knife wounds in the bathtub of their luxurious Upper West Side apartment near Central Park.
Mrs Krim had returned to the flat with her three-year-old daughter Nessie, whom she had taken for a swimming lesson.
Police Commissioner Raymond Kelly said the investigation has yet to reveal anything amiss in the household before the slayings.
Detectives were searching Ortega's home in Washington Heights, a working-class neighbourhood north of where she worked and near Harlem.
It emerged that Ortega had worked for the Krims as a nanny for two years and there did not appear to be any problems.
A Web journal kept by the children's mother spoke lovingly about travelling to the Dominican Republic last February to stay at the home of Ortega's sister.
"We met Josie's amazing familia!!! And the Dominican Republic is a wonderful country!!" she wrote.
Pictures posted on the blog showed the two families posing together for a happy photo, with Ortega hugging Nessie, their cheeks pressed together.
Mrs Krim's husband, Kevin Krim, a CNBC digital media executive, wrote that Ortega's family had nicknamed Nessie "Rapida y Furiosa," (or Fast and Furious), for her energy.
There are tens of thousands of nannies working in New York City, but reports of serious violence by caregivers against children are exceedingly rare.
Across the street from the building where the Krims lived, several nannies with children in pushchairs stood as if stricken, watching police officers milling around the entrance.
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