Harper-Mercer maintained several Internet accounts , including one in which he described himself as mixed race . Media reports said he had an e-mail address linked to an account on a BitTorrent website . The last upload on the account , three days before the Umpqua shooting , was a documentary on the Sandy Hook Elementary School shooting . According to the date of the post , he made an announcement post on 4chan 's / r9k / board possessing the message " Some of you guys are alright . Do n't go to school tomorrow if you 're in the northwest . Happening thread will be posted tomorrow . See you later space robots " . According to the '' Los Angeles Times '' , unnamed law enforcement sources described him as a " hate-filled " man with antireligious and white supremacist leanings , and with long-term mental-health issues . His mother , Laurel Harper , had previously written anonymously in an online forum that both she and her son had Asperger syndrome
Sandy Hook Elementary School shooting
Sandy Hook Elementary School shooting
Umpqua Community College shooting