Courtesy N.Y.P.D.

A 20-year-old man was shot and killed by the police early on Friday as he fled from a group of robbers inside a bodega in the Bronx and collided with a police officer, the authorities said.

The man, who was identified by the authorities as Reynaldo Cuevas, was a worker at the bodega and a nephew of the store’s owner, the police said. He was not armed.

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“The nephew just comes running out full tilt into the officer,” Paul W. Browne, the Police Department’s chief spokesman, said.

Police Commissioner Raymond W. Kelly said that an initial investigation shows that the shooting was the result of an accidental discharge and said that the collision between Mr. Cuevas and the officer who shot him had been captured by a surveillance camera.

“The officer accidentally discharged his weapon, with one round entering Mr. Cuevas’ left shoulder,” Mr. Kelly told reporters at a news conference at 1 Police Plaza.

The episode unfolded around 2 a.m. when three men entered the store, Aneurys Deli on Franklin Avenue at East 169th Street in Morrisania, as it was closing and ordered the manager and Mr. Cuevas to lie on the floor as they stole cash, lottery tickets and cigarettes, the police said.

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Not long after the suspects entered the bodega, a customer glanced through a store window and saw a gunman pointing a pistol at two men on the floor, the police said, and called 911.

Within minutes, the police said, two officers from the local precinct station house and two housing officers from a nearby facility had arrived at the bodega.

Mr. Browne, the Police Department’s chief spokesman, said one of the housing officers looked into the bodega to take stock of the situation.

When the three suspects saw that the police had arrived, they tried to flee through a rear door, Mr. Browne said, adding that the bodega manager heard voices shouting “policia” as the robbers scrambled toward the rear of the store.

Meanwhile, the manager of the bodega and Mr. Cuevas made a run for the front, where four police officers stood within feet of the door, Mr. Browne said. At least one of them, the same officer who had looked inside the bodega moments earlier, had his pistol drawn.

The bodega manager emerged first, exiting without incident to safety. As he did, Mr. Browne said, the man made gestures indicating that a man inside the store was armed. A moment later, Mr. Browne said, Mr. Cuevas emerged, moving quickly with his head lowered, almost as if he feared he might be followed by shots fired from inside.

He ran into an officer and “they became entangled,” Mr. Browne said. At that point, he added, “a round goes off.”

Mr. Cuevas fell to the sidewalk, Mr. Browne said, adding that the officer was partly knocked down.

“We believe it was an accidental discharge,” Mr. Browne said.

Mr. Kelly said: “The tragedy here, of course, is that Mr. Cuevas was shot, but I see nothing wrong with the procedure.”

Mr. Cuevas was struck in the left shoulder, Mr. Browne said, and was taken to St. Barnabas Hospital, where he was pronounced dead.

A man who said he witnessed the shooting, but who declined to give his name, said he did not hear Mr. Cuevas say anything as he ran out of the store.

“He came out scared. The cops didn’t say anything; no one did,” the witness, 25, said. “He ran out with his hands out, and they shot him.”

The man added, “It was an honest mistake because the cops were frightened, as they were patrolling, he came running out.”

After Mr. Cuevas fell to the ground, an officer dragged him away from the scene by one of his arms.

After the shooting, a standoff ensued with the suspects inside the bodega and officers outside, Mr. Browne said. One of the suspects, Christopher Dorsey, 17, left the bodega and surrendered, Mr. Browne said.

Some time later, a second suspect, Ernesto Delgado, 28, left the store, telling officers that he had been held hostage by the gunman inside. The police did not believe that account, Mr. Browne said, and detained Mr. Delgado.

Around 5 a.m., officers from the emergency services unit entered the bodega and found Orlando Ramos, 32, tied up with yellow rope in the bodega’s basement. Mr. Ramos told officers that he had been tied up by robbers who fled, Mr. Browne said, but the police determined that he was in fact the man who had pointed a silver handgun at the bodega manager and Mr. Cuevas.

Mr. Browne said that officers found the weapon, a Harrington and Richardson .32-caliber revolver wrapped in a plastic bag and hidden behind a bag of birdseed on a bodega shelf. It was unloaded, he said. Officers also found a ski mask behind a door to the basement and a gray backpack containing money, scratch-off lottery tickets and Newport cigarettes near the rear of the store.

The officer involved in the shooting was placed on administrative duty, Mr. Kelly said, pending an internal investigation.

Maria Rodriguez, 49, an aunt of Mr. Cuevas, said that her nephew had worked in the bodega for a few months and was helping to support his 3-year-old daughter, who lives in the Dominican Republic.

“He came in yesterday morning, said hello and gave me a kiss,” Ms. Rodriguez said. “I can’t believe I just saw him and then he died.”

Wendy Ruderman contributed reporting.