A gunman opened fire on two mosques in New Zealand on Friday (NZ time), killing at least 40 people.  The motive was racial; the assault was streamed live and documents in support of his attack were posted on line.

At more than 74 pages, the document outlines a white supremacist motivation for the attack. The writer, who identifies himself as a 28-year-old white man born in Australia, quotes the so-called 14 Words, the slogan shared by white supremacists worldwide. He said that while he supported white nationalist groups, he alone had decided to carry out the attack. He described the victims as “invaders” and accused them of seeking to replace white people. He wrote about attacking two mosques, one in Linwood and one in Christchurch. He focused on the latter because it was the largest, he wrote.

The Twitter account only started posting content on March 12, repeatedly sharing white nationalist content about “illegal immigrants.” Twice, the user shared a Facebook profile for the Otago Muslim Association, which the manifesto said was the first choice for the attack.

White supremacy isn’t just an American disease.