White gunman motivated by hate and dressed in tactical gear killed 10 people and wounded three others Saturday afternoon at a Buffalo, New York, supermarket, officials said.

The suspect, an 18-year-old man, shot 13 people — 11 of whom are Black and two who are white — at the Tops Friendly Market, Buffalo Police Commissioner Joseph Gramaglia said.

Officials said he streamed the attack on a social media platform. 

A Twitch spokesperson said the platform has investigated and confirmed that the stream was removed “less than two minutes after the violence started.”

"This was pure evil," Erie County Sheriff John Garcia said at a news conference. "Straight up racially motivated, hate crime from somebody outside of our community — outside of the City of Good Neighbors, as the mayor said — coming into our community and trying to inflict evil upon us." 

An apparent manifesto with the suspect's name, a shared birthdate, and biographical details in common with the suspect, was posted to Google Docs on Thursday night. 

In it, the shooter claimed to have been radicalized online and appeared to adhere to the false replacement theory, which has been used by white killers to justify violence against Muslims, Latinos, and Jewish people around the world. 

He claims in the document that he was radicalized on an extremist 4chan forum while he was “bored” at the beginning of the coronavirus pandemic in early 2020.