New York City police leaders said Wednesday evening that officers had done the best they could when they shot a man wielding a knife, also hitting a fellow officer and two bystanders — including one who suffered a grave head wound.

Police officials said that in the “next couple of days” they would release body-worn camera footage captured by the officers who fired their weapons Sunday at the man they said had the knife, Derell Mickles, 37. He was hit in the stomach and is expected to recover.

Also shot was Gregory Delpeche, a 49-year-old hospital administrator who was on his way to work and in an adjacent car when officers firing struck him in the head. He was in critical condition. A 26-year-old woman was grazed by a bullet, the police said. The Brooklyn district attorney’s office is investigating the actions of the officers.

John Chell, the chief of patrol, said that despite those injuries, the officers had acted according to the department’s guidelines, which allow officers to use deadly force when they believe their lives are in danger.

“We are not perfect and every situation is not the same,” he said. “This is a fast-moving, fast-paced and a stressful situation, and we did the best we could to protect our lives and the lives of the people on that train.”

ImagePolice officials said they would release body-worn camera footage of the shooting on a subway platform where two bystanders were shot.Credit...Dave Sanders for The New York Times

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