ROSEBURG, Ore., Dhu-AlHijjah 18, 1436, Oct 2, 2015, SPA -- The 26-year-old gunman who opened fire in a community college English class, killing nine, was a boot camp dropout who studied mass shooters before becoming one himself, according to AP. Christopher Sean Harper-Mercer, who died during a shootout with police, wore a flak jacket and brought at least six guns and five extra ammunition magazines to school for Thursday's rampage. Investigators said Friday they found another seven guns at the apartment he shared with his mother. The weapons had all been purchased legally over the past three years, some by him, others by relatives, said Salinas Nunes, assistant field agent in charge for the Seattle division of the Bureau of Alcohol, Tobacco and Firearms. Those who knew him described a deeply troubled loner. -- SPA 22:44 LOCAL TIME 19:44 GMT www.spa.gov.sa/w