A heavily armed 18-year-old white man shot 10 people dead on Saturday at a Buffalo, New York grocery store in a "racially motivated" attack that he live-streamed on camera, authorities said.
The gunman, who was wearing body armour and a helmet, was arrested after the massacre, Buffalo Police Commissioner Joseph Gramaglia told a news conference.
Gramaglia put the toll at 10 dead and three wounded. Eleven of the victims were African Americans.
The gunman shot four people in the parking lot of the Tops supermarket, three of them fatally, then went inside and continued firing, Gramaglia said.
Among those killed inside the store was a retired police officer working as an armed security guard.
The guard "engaged the suspect, fired multiple shots," but the gunman shot him, Gramaglia said.
He added that when police arrived, the shooter put the gun to his neck, but was talked down and surrendered.
Stephen Belongia, special agent in charge of the FBI's Buffalo field office, told the news conference that the shooting is being investigated as a hate crime.
"We are investigating this incident as both a hate crime and a case of racially motivated violent extremism," Belongia said.
Erie County Sheriff John Garcia described the attack as "pure evil."
"It was straight-up racially motivated hate crime from somebody outside of our community," he said.
When asked what information led authorities to term the attack a hate crime, Erie County District Attorney John Flynn said they had evidence indicating "racial animosity," but declined to elaborate.
US media outlets have reported officials are investigating a detailed "manifesto" posted online before the shooting, in which the suspect outlines his plans and racial motivations for the attack.
Quoting from the manifesto, the New York Times reported the suspect had been "inspired" by white supremacist acts of violence, including the massacre of 51 Muslims in Christchurch, New Zealand in March 2019.
A semi-automatic weapon used in Saturday's shooting also had a racial epithet written on it as well as the number 14 - a reference to a white supremacist phrase - according to local daily The Buffalo News, citing a local official.
District Attorney Flynn said in the press conference that the shooter used an "assault weapon" - a term that can apply to types of rifles and shotguns in New York - but did not specify which kind.
Flynn's office said in a tweet Saturday night that the suspect - identified as Payton Gendron of Conklin, New York - had been arraigned on a charge of first-degree murder, which carries a sentence of life without parole. He is being held without bail.
Asked during the earlier press conference if the shooter could face the death penalty at the federal level, the US attorney for the Western District of New York, Trini Ross, said: "All options are on the table as we go forward with the investigation."
'Day of great pain'
Byron Brown, the mayor of Buffalo - which is located in western New York State, along the US border with Canada - said the shooter "travelled hours from outside this community to perpetrate this crime."
"This is a day of great pain for our community," Brown said.
White House Press Secretary Karine Jean-Pierre said US President Joe Biden had been briefed on the "horrific shooting."
In a statement, Biden thanked police and first responders and denounced the attack.
"Any act of domestic terrorism, including an act perpetrated in the name of a repugnant white nationalist ideology, is antithetical to everything we stand for in America," he said.
Senate Majority Leader Chuck Schumer, the senior US senator from New York, said in a tweet: "We are standing with the people of Buffalo."
The governor of New York, Kathy Hochul, described the killings as a "horrific white supremacist shooting" in a tweet that also praised the grocery store security guard as "a true hero."
A spokesperson for streaming service Twitch confirmed to AFP that the shooter used the service to broadcast the attack.
"We have investigated and confirmed that we removed the stream less than two minutes after the violence started," the spokesperson said, adding: "We are taking all appropriate action, including monitoring for any accounts rebroadcasting this content."
Wave of gun violence
The Buffalo shooting follows other recent instances of racially motivated mass killings in the United States.
In 2019, a white gunman travelled hours across the state of Texas and killed 23 people at a Walmart in El Paso, where the vast majority of the population is Hispanic.
Four years earlier, in Charleston, South Carolina, a white man opened fire in an African American church, killing nine.
In both instances, the men posted hate-filled manifestos online before their shooting rampages.
Despite recurring mass-casualty shootings and a nationwide wave of gun violence, multiple initiatives to reform gun regulations have failed in the US Congress, leaving states and local councils to enact their own restrictions.
The United States suffered 19,350 firearm homicides in 2020, up nearly 35% compared to 2019, the Centers for Disease Control and Prevention (CDC) said in its latest data.
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