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Mass murder - Wikipedia
Mass murder | Definition, Cases, Statistics, & Facts | Britannica
A list of mass killings in the United States this year | AP News
Mass killings in US: Database shows mass casualty shootings in …
State of the World: Mass Killing in 2021 | Early Warning Project
A list of mass killings in the United States since January
A List of Recent Mass Shootings in the United States
US hits new record for the deadliest six months of mass killings
Mass Murder in America: Trends, Characteristics, Explanations, and ...
Mass Shootings in the United States in 2021 - The New York Times