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Russia's Investigative Committee, which handles major crimes, said it was looking into the attacker's suspected neo-Nazi links.
Officers responded at around 12:55pm to a flood of 911 calls about an active shooter at the school
Some of the worst mass shootings in the United States have occurred in Colorado. In addition to Columbine, a man opened fire at a movie theatre in Aurora, another Denver suburb, in 2012, killing 12 people and wounding scores more.