This undated photo from a MySpace page that appeared to belong to Chris Harper Mercer shows him holding a rifle. Authorities identified Mercer as the gunman who went on a deadly shooting rampage at Umpqua Community College in Roseburg, Ore., on Thursday, Oct. 1, 2015. (MySpace via AP Photo)

Oregon gunman was Army dropout who studied mass shooters

The weapons used in the attack had all been purchased legally over the past three years, some by the shooter, others by relatives, said Celinez Nunez, assistant field agent for the Seattle division of the Bureau of Alcohol, Tobacco and Firearms.

EPA Ozone levels

US issues new ozone rules,setting up clash with Republicans

The move fulfills a long-delayed campaign promise by President Barack Obama, but sets up a fresh confrontation with Republicans already angry about the administration’s plans to curb carbon pollution from coal-fired power plants.