The man accused of killing nine people at a community college in Oregon left behind a manifesto detailing his grievances, US media report.
Chris Harper Mercer opened fire last Thursday inside a classroom at Umpqua Community College and then killed himself when police arrived.
A police source told the Associated Press that Mercer complained in the document about not having a girlfriend. He also wrote that everyone else was “crazy” and that he was the sane one.
Meanwhile President Barack Obama announced on Monday that he would travel to Roseburg, Oregon, on Friday to visit survivors and relatives of the victims.
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