Chris Harper Mercer is the alleged gunman who killed 10 at Umpqua Community College. But did he say he was going to on a shooting spree on 4Chan the night before? Right now it's unconfirmed if Mercer is indeed behind the 4Chan posts last night. Screencaps from the the online forum suggest some discussion of a school shooting taking place in the Pacific Northwest last night. Above is a screencap of the board. Click on for more information.