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Suspect in Colorado mass shooting is a 21-year-old man who bought assault rifle six days earlier, authorities say
The attack in Boulder stunned a state that has seen several mass shootings, including the 1999 Columbine High School massacre and the 2012 Aurora movie theater shooting.
![A man leaves a bouquet on a police cruiser parked outside the Boulder Police Department after an officer was one of the victims of a mass shooting at a King Soopers grocery store in Boulder, Colo.](https://www.inquirer.com/resizer/v2/EDPZOISDMNBQLNKYBK5DITJNNI.jpg?auth=1957382f496718a455f2f9ddffe54bd6af3ba116d1564c930d0c8b4c67e1610d&width=760&height=507&smart=true)