D.C. Shooter Shared Video of His Attack on 4Chan, Then Edited Wikipedia Page

28-year-old Brenton Tarrant killed 51 people in New Zealand in 2019. The Associated Press reports that at that point he'd been reading 4Chan for 14 years, according to his mother — since the age of 14.

The year before, 25-year-old Alek Minassian, who killed 11 people in Toronto in 2018, namechecked 4Chan in a pre-attacked Facebook post.

But the Guardian now adds another a story from nine days ago — when a 23-year-old shooter with 1,000 rounds of ammunition opened fire from his apartment in Washington D.C. Just two minutes after the shooting began, someone under the username "Raymond Spencer" logged onto the normally-anonymous 4chan and started a new thread titled "shool [sic] shooting". The newly published message contained a link — to a 30-second video of images captured from the digital scope of Spencer's rifle.... Even as police stormed the apartment building where Spencer hid, with officers maneuvering past a surveillance camera that he had set up in the hallway and was monitoring, Spencer continued to post to the message board. "They're in the wrong part of the building right now searching," he posted at one point. A few minutes later: "Waiting for police to catch up with me." As he waited, Spencer logged on to Wikipedia to edit the entry for Edmund Burke School, which he had just opened fire on....

Police believe Spencer shot himself to death as officers breached his apartment.