After the racially motivated massacre that left ten dead in Buffalo, Joe Biden announced that he would be visiting the city with his wife.

"Jill and I will travel to Buffalo on Tuesday to mourn with the community who lost ten lives in a senseless and horrific massacre," the US President wrote on Twitter on Sunday evening.

Sofia Dreisbach

North American political correspondent based in Washington.

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As it became known the day after the attack, the 18-year-old perpetrator spoke to classmates about such an act in June last year.

It was "not a specific threat" against any specific location or individuals, a New York State Police Department spokesman said on Sunday.

The student, then 17 years old, was taken into custody in June 2021, psychiatrically examined in a hospital and released after a day and a half.

The New York Times, citing an official familiar with the matter, reports that when asked about plans after graduation, the perpetrator replied that he was planning a killing spree.

He is said to have later claimed it was a joke.

Two weeks after the incident, the young man's school days ended and he apparently initially disappeared from the radar of the police.

A law of the state of New York, which allows prohibiting the possession of weapons potentially dangerous for oneself and other persons, was not applied in his case.

It came into effect in 2019 in response to the Parkland massacre in February 2018, in which a 17-year-old boy shot and killed 17 people at his old school.

Erie County Police Department Chief John Garcia said Monday the offender's mental health problems had become apparent over the past year.

"But in this case, the arms dealer was able to sell him the guns because there were no warnings." The perpetrator is being closely monitored, according to Garcia.

When he was arrested on Saturday, the man initially pointed his gun at himself but was then persuaded by officers to surrender, police said.

In a 180-page manifesto released before the attack, the shooter described himself as a supporter of the racist narrative of "white supremacy" and said he had prepared for the attack "for years".

On Saturday, the perpetrator drove about two hundred miles from Conklin to Buffalo and shot ten people and injured three, eleven of them black, in the parking lot and in a supermarket.

District Attorney John Flynn told CNN on Monday that investigators are examining all the evidence, including combing the home where the perpetrator lived with his parents, his car and his social media accounts.

In his manifesto, the young man stated that he wanted to shoot more "black people on the street" after the attack on the supermarket.