VIDEO: Oregon gunman was army dropout who studied mass shooters

The 26-year-old gunman who opened fire on fellow students in his college English class, killing nine people, was an army boot camp dropout who studied mass shooters before becoming one himself.

A day after the rampage in Oregon timber town of Roseburg, the authorities said Chris Harper-Mercer wore a flak jacket and brought at least six guns and five ammunition magazines to Umpqua Community College.