The gunman who killed nine people at an Oregon college had served in the U.S. Army for about a month in 2008 before being discharged for failing to meet administrative standards, military records showed.
Christopher Harper Mercer was enlisted from Nov. 5 until Dec. 11 in 2008 in Fort Jackson, S.C., according to the records.
CNN, citing law enforcement sources, said Mercer had left behind writings that showed animosity toward black people.