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New York • New York City's mayor castigated a police sergeant Wednesday for fatally shooting a mentally ill, 66-year-old woman brandishing a baseball bat, saying her "tragic" and "unacceptable" death resulted from failure to follow basic policies.

"Our officers are supposed to use deadly force only when faced with a dire situation. It's very hard to see that standard was met," a somber Mayor Bill de Blasio said. "Something went horribly wrong here."

The unusual rebuke came less than 24 hours after Deborah Danner, who is black, was shot to death in her Bronx apartment. And it came even as investigators were still looking into why the white officer didn't call for an emergency services and didn't use his stun gun.

"Deborah Danner should be alive right now, period," the mayor said. "If the protocols had been followed, she would be alive. It's as simple as that."

Earlier, New York police Commissioner James O'Neill said his department "failed" by not using means other than deadly force.

"That's not how it's supposed to go," O'Neill said. "It's not how we train; our first obligation is to preserve life, not to take a life when it can be avoided."

The head of the police union representing sergeants, Ed Mullins, said the shooting was self-defense and bemoaned what he characterized as a politically motivated rush to judgment.

"We could be sitting here talking about how a 66-year-old ... fractured his skull," Mullins said.

Police were responding to a 911 call about an emotionally disturbed person around 6:15 p.m. Tuesday when an eight-year veteran of the force, Sgt. Hugh Barry, encountered Danner in her seventh-floor apartment, police said.

Officers had been called to Danner's home several times before to take her to the hospital during psychiatric episodes, the mayor said. Each of those times, she was taken away safely. This time was different. Barry persuaded Danner to drop a pair of scissors she was holding, but when she picked up the bat and tried to strike him, he fired two shots that hit her torso, police said.