A breakdown of the numbers:

• 934 people have been killed in mass shootings over the past seven years

• 88 people were killed in 2012 in a total of 16 mass shootings

• 16 mass shootings since Newtown (December 14, 2012), each killing four or more people
• 67 mass shootings in the last three decades, 30 of which have occurred since 2006

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