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Police walk outside the Tops grocery store on May 15, in Buffalo, N.Y.Joshua Bessex/The Associated Press

The white gunman accused of massacring 10 Black people in a racist rampage at a Buffalo supermarket taunted law enforcement online last month and visited Buffalo back in March, investigators said Monday.

Payton Gendron, 18, began posting threads on the social media platform Discord about body armour and guns, and last month made provocative remarks about federal law enforcement, the FBI agent in charge for Buffalo, Stephen Belongia, said on a call between law enforcement officials and private-sector and university partners. The Associated Press obtained a recording of the call.

Meanwhile, Buffalo Police Commissioner Joseph Gramaglia disclosed that Mr. Gendron, who lives about 320 kilometres away in Conklin, N.Y., had been in Buffalo two months ago. Mr. Gramaglia declined to say more about that trip.

The police commissioner also told CNN that Mr. Gendron planned to keep on killing if he had escaped the scene and even talked about shooting up another store.

“He was going to get in his car and continue to drive down Jefferson Avenue and continue doing the same thing,” Mr. Gramaglia said.

The commissioner’s account was similar to portions of a racist 180-page document, purportedly written by Mr. Gendron, that said the assault was intended to terrorize all non-white, non-Christian people and get them to leave the country. Federal authorities were working to confirm the document’s authenticity.

Authorities said Mr. Gendron wielded an AR-15-style rifle, wore body armour and used a helmet camera to livestream the bloodbath on the internet. He surrendered inside the supermarket and was arraigned on a murder charge over the weekend. He pleaded not guilty and was jailed under a suicide watch.

Federal prosecutors said they are contemplating hate crime charges.

Former Buffalo Fire commissioner Garnell Whitfield Jr., who lost his 86-year-old mother, Ruth Whitfield, in the shooting, asked how the country could allow its history of racist killings to repeat itself.

“We’re not just hurting. We’re angry,” Mr. Whitfield said at a news conference with civil rights attorney Ben Crump and others. “We treat people with decency, and we love even our enemies.”

“And you expect us to keep doing this over and over and over again – over again, forgive and forget,” he continued. “While people we elect and trust in offices around this country do their best not to protect us, not to consider us equal.”

Mr. Whitfield’s mother was killed after making her daily visit to her husband in a nursing home.

“How do we tell him that she’s gone? Much less that she’s gone at the hands of a white supremacist? Of a terrorist? An evil person who is allowed to live among us?” Mr. Whitfield said.

The victims also included a man buying a cake for his grandson; a church deacon helping people get home with their groceries; and a supermarket security guard.

Messages were left with Mr. Gendron’s attorneys Monday. No one answered the door at his family’s home in the morning, and relatives did not respond to messages.

Law enforcement officials said Sunday that New York State Police troopers had been called to Mr. Gendron’s high school last June for a report that the then-17-year-old had made threatening statements. The threat was “general” in nature and not related to race, Mr. Gramaglia said.

He said Mr. Gendron had no further contact with law enforcement after a mental-health evaluation that put him in a hospital for a day and a half.

It was unclear whether officials could have invoked New York’s “red flag” regulation, which lets law enforcement, school officials and families ask a court to order the seizure of guns from people considered dangerous. Authorities would not say when Mr. Gendron acquired the weapons he had during the deadly attack.

Federal law bars people from owning guns if a judge has determined they have a “mental defect” or they have been forced into a mental institution. An evaluation alone would not trigger the prohibition.

At the White House, U.S. President Joe Biden, who planned a visit Tuesday to Buffalo, paid tribute to one of the victims, security guard and retired police officer Aaron Salter. Mr. Salter fired repeatedly at the attacker, striking his armor-plated vest at least once before being shot and killed. Mr. Biden said Mr. Salter “gave his life trying to save others.”

Authorities said that in addition to the 10 Black people killed, three people were wounded: one Black, two white.

Mr. Gendron researched the neighbourhood’s demographics and conducted reconnaissance before the attack, investigators said. Mayor Byron Brown said the gunman “came here with the express purpose of taking as many Black lives as he possibly could.”

Zeneta Everhart said her son, supermarket employee Zaire Goodman, was helping a shopper outside when he saw a man get out of a car in military gear and point a gun at him. Then a bullet hit Mr. Goodman in the neck.

“Mom! Mom, get here now, get here now! I got shot!” he told his mother by phone. Mr. Goodman, 20, was out of the hospital and doing well Monday, his mother said.

In livestreamed video of the attack circulating online, Mr. Gendron trained his weapon on a white person cowering behind a checkout counter, but said, “Sorry!” and didn’t shoot. Screenshots purporting to be from the broadcast appear to show a racial slur against Black people scrawled on his rifle.

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