Oregon shooting: Gunman had been discharged after a month in US Army

The gunman who killed nine people at an Oregon college had served in the US 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 November 5 until December 11 in 2008 in Fort Jackson, SC, according to the records.

CNN, citing law enforcement sources, said Mercer had left behind writings that showed animosity toward black people. 

Read: Oregon shooter came from California, described as shy and skittish

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