CHARLOTTE, N.C. — A second night of protests sparked by the police killing of a black man spiraled into chaos and violence after nightfall on Wednesday when a demonstration was interrupted by gunfire that killed a man in the crowd and law enforcement authorities fired tear gas in a desperate bid to restore order.
Within an hour, officials used the city’s Twitter account to confirm the death of the unidentified man, which they attributed to a “civilian on civilian” confrontation.
The mayhem, in the heart of Charlotte’s dazzling Uptown district, was the second night of extraordinary tension in North Carolina’s largest city, where a police officer killed a black man on Tuesday afternoon.
On Wednesday night, police officers, many of them dressed in riot gear and standing in formation, made numerous arrests. A helicopter flew over Uptown, and on the streets below, protesters were heard chanting, “Hands up! Don’t shoot!”
The unrest in Charlotte came after two other police-involved deadly shootings within the last week.
First was the shooting of a teenager in Columbus, Ohio, who had been brandishing a BB gun. Two days later, on Friday, was the shooting death in Tulsa, Okla., of a man who had his hands above his head before an officer opened fire.
And then it was Charlotte, where Keith L. Scott, 43, black like the other two, was shot by a police officer in a parking space marked “Visitor” outside an unremarkable apartment complex on Tuesday. On Wednesday that parking space was both the site of a fatal shooting and a shrine, and Charlotte was a city on edge, the latest to play a role in what feels like a recurring, seemingly inescapable tape loop of American tragedy.
“To see this happen multiple times — just time after time — it’s depressing, man,” said Tom Jackson, 25, who works with mentally disabled people. He didn’t know Mr. Scott but was drawn here nonetheless, one of many strangers and friends who came to pay their respects and make sense of their sorrow.
In addition to the fatal attacks on police officers in Baton Rouge and Dallas, it was another grim snapshot of America’s continuing crisis in black and blue, this moment amplified by presidential politics. And as usual, there was very little consensus on what went wrong and how to fix it.
At a news conference on Wednesday, Kerr Putney, chief of the Charlotte-Mecklenburg Police Department, said officers had found the gun that the police said Mr. Scott had brandished before an officer fatally shot him and were examining police video of the encounter that unfolded as Mr. Scott stepped out of a car.
Family members of Mr. Scott have said that he was unarmed and was holding only a book. Chief Putney said Wednesday morning, “We did not find a book.”
Reeling from a night of protest and looting, Charlotte was uneasy on Wednesday and bracing for more. There was also a palpable sense of frustration that a solution to the problem — an antidote for what Benjamin L. Crump, a lawyer for the family of Terence Crutcher, 40, the man shot in Tulsa, recently called “an epidemic” — would not be soon coming. Some activists who spoke at a news conference called for an economic boycott of Charlotte.
Gov. Pat McCrory, a former Charlotte mayor, said in a statement Wednesday afternoon that state officials would “do everything we can to support the mayor and the police chief in their efforts to keep the community calm and to get this situation resolved.”
The response of B.J. Murphy, an African-American activist here, could not have been more different: “Everybody in Charlotte should be on notice that black people, today, we’re tired of this,” he said, adding an epithet. “We’re tired of being killed and nobody saying nothing. We’re tired of our political leaders going along to get along; they’re so weak, they don’t have no sympathy for our grief. And we want justice.”
All three shootings are under investigation, and are rife with questions and complications. The police in Columbus said that the BB gun wielded by 13-year-old Tyre King was built to look nearly identical to a Smith & Wesson Military & Police semiautomatic pistol. Mayor Andrew J. Ginther blamed the shooting, in part, on Americans’ “easy access to guns, whether they are firearms or replicas.”
In Tulsa, the police said investigators found the drug PCP in Mr. Crutcher’s S.U.V. The drug is known to induce erratic behavior in some users. But Mr. Crump, who is representing Mr. Crutcher’s family, said the discovery of the drug, if true, would not justify the deadly shooting.
In an interview on Wednesday, Mr. Crutcher’s father, the Rev. Joey Crutcher, said his son had marched in protest of earlier police killings of blacks and had thought thoroughly about how to protect himself during interactions with police officers.
They had planned to go to a church event aimed at teaching people how behave around the police and avoid becoming another hashtag shared on social media by Black Lives Matter protesters.
“I never thought this would happen to my family,” Mr. Crutcher said, adding that he had counseled his son all his life about how to behave around the police.
“I said, ‘Whenever you’re stopped by a police and you’re in that situation, raise your hands up, always let them see your hands, let them see that you are not going for a gun.’ And that is what Terence was doing. I said, ‘Always put your hands on your car.’ I made that specific, ‘your car.’ And that’s what Terence was walking to do on his car so that they could see his hands.”
Here in Charlotte, officials urged calm and reiterated their position that the Tuesday afternoon shooting of Mr. Scott occurred after he posed an “imminent deadly threat” to police officers.
But at the University City apartment complex where Mr. Scott was killed, critics of the city government suggested that investigators were covering up a murder, and cast doubts on the police account.
John Barnett, a civil rights activist in Charlotte, said during a raucous news conference near the site of the shooting that Mr. Scott had been waiting for his son to arrive home from school.
“The truth of the matter is, he didn’t point that gun,” Mr. Barnett said. “Did he intend to really sit in a vehicle, waiting on his son to get home from school and then plot to shoot a cop if they pulled up on him?”
Adding to an atmosphere loaded with suspicion and mistrust, residents of the apartment complex gave varying accounts of Mr. Scott’s death.
Some differed from the police on which officer fired the shots, and others said that no one had tried to administer CPR on Mr. Scott as officials had said.
“Since black lives do not matter for this city, then our black dollars should not matter,” said Mr. Murphy, the activist. “We’re watching a modern-day lynching on social media, on television and it is affecting the psyche of black people.”
Attorney General Loretta E. Lynch said Wednesday that the Justice Department “is aware of, and we are assessing, the incident that led to the death of Keith Lamont Scott in Charlotte.”
Responding to another police shooting, the state’s attorney in Baltimore County, Md., Scott D. Shellenberger, announced Wednesday that no charges would be filed against any of the officers involved in the Aug. 1 shooting death of Korryn Gaines or the shooting of her 5-year-old son.
In Charlotte, Chief Putney said protesters blocked Interstate 85 into Wednesday morning and looted material from a tractor-trailer before setting the cargo ablaze. Other demonstrators threw rocks at officers, causing at least 16 injuries and damage to several police cars. The police made one arrest and used tear gas to disperse protesters.
The protests had begun peacefully, the chief said, but “when that behavior becomes violent,” officers were compelled to respond more aggressively.
In a statement late Wednesday, Rakeyia Scott, Mr. Scott’s wife, said the family was “devastated” by the shooting of Mr. Scott, whom she described as “a loving husband, father, brother and friend.”
Ms. Scott said that after hearing the police chief’s remarks, the family had “more questions than answers about Keith’s death.” She also asked protesters to remain peaceful.
At a campaign rally in Orlando, Fla., Hillary Clinton spoke about the shootings here and in Tulsa.
“There is still much we don’t know about what happened in both incidents, but we do know that we have two more names to add to a list of African-Americans killed by police officers in these encounters,’’ she said.
“It’s unbearable, and it needs to become intolerable. We also saw the targeting of police officers in Philadelphia last week. And last night in Charlotte, 12 officers were injured in demonstrations following Keith Scott’s death. Every day police officers are serving with courage, honor and skill.”
Her Republican rival, Donald J. Trump, reacted on Twitter. “Hopefully the violence & unrest in Charlotte will come to an immediate end,” he wrote. “To those injured, get well soon. We need unity & leadership.”
Unity, thus far, has been in short supply. On Friday, Mr. Trump earned the endorsement of the Fraternal Order of Police. But polls show that his support among African-Americans is negligible, even though he has singled them out in promising to solve the ills of poverty and violence that he has characterized as plaguing black neighborhoods.
On Wednesday, Mr. Jackson, the man who came here to mourn, was not thinking about the candidates of today, but the candidates of the future, and potential squandered by the lives cut short.
The police, he said, “are out here killing people, and they don’t even know their backgrounds,” he said. “They could be killing the next president.”
Correction: September 21, 2016
This article has been revised to reflect the following correction: An earlier version of this article gave an incorrect time for the shooting. It occurred just before 4 p.m., not after 4.
Emily Harris contributed reporting from Charlotte, and Yamiche Alcindor, Niraj Chokshi and Timothy Williams from New York. Alain Delaquérière contributed research.