Buffalo (New York), May 19 (AP) The white man accused of killing 10 Black people at a Buffalo supermarket appeared briefly in court on Thursday after a grand jury indicted him on a first-degree murder charge.

Assistant district attorney Gary Hackbush said the indictment of Payton Gendron, 18, was handed up Wednesday.

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Gendron, wearing orange clothing and mask, was silent throughout the proceeding and sent back to jail.

Someone shouted “Payton you're a coward!” as he was led out.

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Ten people were killed and three others wounded in the Saturday shooting at the Tops Friendly Market in a predominantly Black neighbourhood of Buffalo. Authorities are continuing to investigate the possibility of hate crime and terrorism charges.

Investigators have been examining those documents, which included a private diary he kept on the chat platform Discord.

At his initial court appearance last week, Gendron's court-appointed lawyer entered a plea of “not guilty” on his behalf.

The massacre at the Tops supermarket was unsettling even in a nation that has become almost numb to mass shootings.

All but two of the 13 of the people shot during the attack were Black. Gendron's online writings said he planned the assault after becoming infatuated with white supremacist ideology he encountered online.

The diary said Gendron planned his attack in secret, with no outside help, but Discord confirmed Wednesday that an invitation to access his private writings was sent to a small group of people about 30 minutes before the assault began.

Some of them accepted the invitation. It was unclear how many read what he had written or logged on to view the assault live. It also wasn't clear whether anyone tried to alert law enforcement.

Buffalo Police Commissioner Joseph Gramaglia has said investigators were working to obtain, verify and review Gendron's online postings.

New York Gov. Kathy Hochul on Wednesday authorised the state's attorney general, Letitia James, to investigate social media platforms used by Gendron to determine if they were liable for “providing a platform to plan and promote violence.”(AP)

(The above story is verified and authored by Press Trust of India (PTI) staff. PTI, India’s premier news agency, employs more than 400 journalists and 500 stringers to cover almost every district and small town in India.. The views appearing in the above post do not reflect the opinions of LatestLY)