The manifesto, which was not modified since it was posted on Thursday, includes elaborate details of a planned shooting. The document claims the suspect chose Buffalo because it was the city with the highest number of Black people in his vicinity.

Eleven of the 13 people shot at the Tops Friendly Market are Black, police said.

A senior law enforcement official told NBC News that authorities were working to verify the document’s authenticity…

The manifesto includes dozens of pages antisemitic and racist memes, repeatedly citing the racist “Great Replacement” conspiracy theory frequently pushed by white supremacists, which falsely alleges white people are being “replaced” in America as part of an elaborate Jewish conspiracy theory. Other memes use tropes and discredited data to denigrate the intelligence of non-white people.