Nanny stabs children on NYC Upper West Side, mother and herself

Warzer Jaff

HORRIFYING: Nanny Yoselyn Ortega — her shirt bloody from an apparently self-inflicted throat wound — is wheeled away by medics yesterday as police help a devastated Marina Krim and her other daughter into an ambulance outside her apartment on the Upper West Side.

Warzer Jaf

HORRIFYING: Nanny Yoselyn Ortega — her shirt bloody from an apparently self-inflicted throat wound — is wheeled away by medics yesterday as police help a devastated Marina Krim and her other daughter into an ambulance outside her apartment on the Upper West Side.

A Manhattan mom out running errands returned to her luxury Upper West Side apartment last night and walked into a nightmare — her two young children had been stabbed to death by their nanny, who then slit her own throat in a suicide attempt, police sources said.

The mother, Marina Krim, arrived at her West 75th Street home at 5:34 p.m. after nanny Yoselyn Ortega, 50, failed to meet her for swimming lessons with the kids she was watching — Leo, 2, and Lucia, 6.

The building’s doorman told Krim the nanny hadn’t left, and she went upstairs to find the reason for the hold-up. She found Ortega slashing her own neck, with both her wrists already slit and bleeding.

Krim rushed to the bathroom of the second-floor apartment and found Leo and Lucia in the tub, lying in a pool of blood with stab wounds all over their bodies.

“Something happened to my kids!” screamed the sobbing mom, who wrapped the nanny’s neck with a towel.

The doorman, Glen Loody, heard her and called 911. “She was crying. She was screaming,” he said.

The kids appeared to be breathing as they were rushed to St. Luke’s Hospital but were pronounced dead on arrival.

Krim and her surviving middle child, Nessie, 3, — who did not see the carnage — were also taken to St. Luke’s, where Krim had to be sedated.

Ortega, who was is in police custody, was taken to New York-Cornell Hospital, unresponsive, in critical but stable condition. Police believe she may have taken pills, a law-enforcement source said.

She has no criminal record and had not yet been charged with a crime late last night, sources said.

The children’s paternal grandmother, Karen Krim, said Ortega came into the family’s life about a year ago.

Up until then, Marina Krim was a stay-at-home mom and cared for the kids exclusively. The Krims decided to hire a nanny when Leo was born.

Marina and Kevin Krim had been extra careful in hiring Ortega — and even spent nine days with her family in the Dominican Republic beforehand.

“Kevin told me that she was a nice girl,” the grandmother told The Post, sobbing. “How could she do something like that?

“The children were angels.”

Ortega’s niece, Katherine Garcia, 28, said her aunt had seemed a little off and was “acting kind of nervous lately.”

“This is just shocking,” she said. “She loved those kids. I don’t know what would make her do this.”

The children’s father, CNBC executive Kevin Krim, was returning from a.....REST OF IT