10 Dead in Colorado Mass Shooting

A lone gunman killed 10 people, including the first police officer who responded, at a crowded supermarket in Boulder, Colo., on March 22. Police have charged a suspect with 10 counts of first degree murder, but no possible motive has been named. Hundreds of law enforcement officers responded to the attack. It was the seventh mass killing this year in the U.S., according to a database maintained by the Associated Press, USA Today and Northeastern University.

10 Dead in Colorado Mass Shooting

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