An Instagram account bearing the suspect's name, created four days ago, posted two messages shortly before the attacks, including a reference to a white supremacist text.
One post was a photo of people walking around the Garlic Festival with the words "Ayyy garlic festival time Come get wasted on overpriced sh**." The other post, made about an hour later, showed a sign of Smokey Bear saying "Fire Danger High Today."
"Read Might is Right by Ragnar Redbeard," the caption said. "Why overcrowd towns and pave more open space to make room for hordes of mestizos and Silicon Valley white tw**s?"
A "mestizo" is a person of mixed descent, usually white and Hispanic, or white and American Indian. "Might is Right" is a book published in the late 1800s which has been described as a white supremacist text that promotes anarchy, vilifies Christianity and calls Jesus the "true Prince of Evil." The natural order, according to the book, is a world at war in which the strong must vanquish the weak, and white men must rule over those of color.