The encounter was breathtakingly brief: a surveillance video showed a gunman outside the Empire State Building on Friday pulling a pistol, pointing it at two police officers, their firing at him and his falling to the sidewalk.
All the yelling and cries of pain occurred out of camera view, just north of where the gunman, Jeffrey T. Johnson, collapsed and died: nine bystanders were struck, cradling bloody arms or lying on the sidewalks and curbs.
The police commissioner, Raymond W. Kelly, confirmed on Saturday that all nine were wounded by police bullets, bullet fragments or shrapnel from ricochets. Mr. Kelly also confirmed that the shooter, Mr. Johnson, never fired another shot after killing a former co-worker, Steven Ercolino, moments earlier.
“We had a witness that said that Johnson fired at the police,” Mr. Kelly said Saturday. “But the final count of the shells, it appears that that is not the case.”
It was the second time in two weeks that police officers fired fusillades on the crowded streets of Midtown — 28 shots fired between the two episodes — and with it, there were once again questions of police protocol in urban settings. In the first shooting, no bystanders were struck when officers fired 12 shots at a man with a knife just south of Times Square.
The nanosecond speed at which a shooting plays out is followed by hours of analysis, second-guessing and study.
There is no national data on how often bystanders are struck by police bullets; Geoffrey P. Alpert, a criminologist at the University of South Carolina and an expert on the police use of force, said that hitting innocent civilians “doesn’t happen very often, but it happens.”
He added: “The rule of thumb is that you do not put civilians in the line of fire, but the rule of thumb is also that you don’t let a murderer get away.”
In many police shootings, stray shots are almost inevitable; a study based on New York’s annual firearms discharge reports indicated that officers hit their targets 34 percent of the time.
“It’s a tense situation, people are scared and moving,” Professor Alpert said. “It’s not like the movies, where you can shoot the gun out of his hand.”
The New York Police Department does include such episodes in its firearms discharge report. In 2010, for example, the police hit three bystanders in a shootout with a gunman; the year before, one bystander was struck when an officer struggled with a suspect who was trying to take his gun, and the gun fired.
Those encounters are some of the more trying for officers.
“One of the grim realities of police work,” reads a recent annual report, “is the terrible contradiction that can arise when it becomes necessary to protect life by using deadly physical force.”
The patrol guide, the department’s manual, states that officers should not fire their weapons when, “in their professional judgment, doing so will unnecessarily endanger innocent persons.”
In the shooting in Midtown, Mr. Kelly said on Friday that the two officers “had absolutely no choice.” In Mr. Johnson’s bag, officers found a clip loaded with six rounds, the police said.
The courts tend to come down on the side of officers in lawsuits brought from bystanders injured by police bullets.
A variety of outcomes after having been struck by a police bullet — physical, psychological, legal — can be found in a gun battle in Harlem in 2005 outside the restaurant Sylvia’s, another New York City landmark.
A suspect opened fire on officers, and five of them fired back 25 times, killing him. When it was over, a woman was kneeling in the street over her baby and bleeding from a gunshot wound to the elbow, and a 78-year-old man carrying groceries was stooped to help them.
“I got up,” the man, Garnold M. King, recalled in an interview, “and put my hand on my back and said, ‘Oh my God, I was shot too!’ ”
The Police Department was sued. One lawsuit, filed by the wounded woman, Tammy Johnson, went all the way to the Court of Appeals before being thrown out in 2010 in a 4-to-3 decision; the majority opinion stated that the officers “clearly had probable cause to fire their weapons at the suspect: they were in pursuit of an armed individual who opened fire on them on a public street, endangering the lives of the officers and the public.” New York City officials say they believe that finding strengthens their position in cases like these.
Ms. Johnson, then 39, had been playing with her 17-month-old daughter when she was struck. That moment changed her. She quickly moved to Atlanta.
“I didn’t feel safe in New York City anymore,” she said in an interview Friday.
Read more at The NY Times