There have been at least 21 deadly mass shootings in the US so far in 2019 - ABC News
Florida is now home to two of the worst mass shootings in modern U.S. history | Blogs
Does a Meme Show the Faces of Suspected Mass Shooters in U.S. in 2019? | Snopes.com
Were AR-15s Used in These Mass Shootings? | Snopes.com
Updated List of Mass Shootings in US in 2021 so Far
List of Deadliest Mass Shootings in the US
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Were AR-15s Used in These Mass Shootings? | Snopes.com
Presidents and Mass Shootings | National Affairs
Chart: Mass Shootings in America | Statista
Boulder shooting: Ten victims and suspect identified by police - BBC News
US Mass Shootings, 1982–2021: Data From Mother Jones' Investigation – Mother Jones
School shootings in the US compared with the rest of the world - CNN
Mass Shootings in the United States in 2021 - The New York Times
Mass shootings in the US have risen sharply in 2020 – why?
Mass shooting in the U.S.: Blame the NRA.
Mass Shootings Have Become More Common In The U.S. | FiveThirtyEight
A Partial List of Mass Shootings in the United States in 2021 – DNyuz
US Schools Have Survived 101 Mass Shootings in 2018 (FULL LIST)
The US averaged at least 1 deadly mass shooting a month in 2018 - ABC News
Deadliest Mass Shootings in US History: 3 Happened in Last 18 Months
List of mass shootings in the United States in 2021 - Wikipedia
Fusion Center Study Finds 79% of Recent Mass Shootings Attributable to History of Mental Illness | Public Intelligence
Mass shootings by shooter's race in the U.S. 2021 | Statista
