Definition and Data Sources
Mass shootings are typically defined as incidents in which four or more people are shot, excluding the shooter, in a single location and time. Researchers and journalists often rely on databases maintained by organizations such as the Gun Violence Archive and academic studies to compile these figures.
2017 Death Toll and Notable Incidents
In 2017, mass shootings in the United States resulted in a significant number of fatalities and injuries. The deadliest single incident that year occurred in Las Vegas, Nevada, where a gunman fired from a hotel suite into a large crowd during a music festival, killing dozens and injuring hundreds before law enforcement intervened.
Broader Context and Ongoing Research
Analysts examine mass shooting deaths alongside other firearm fatalities to understand patterns, risk factors, and potential policy impacts. Federal and nonprofit researchers continue to study these events to improve prevention strategies, crisis response, and public health outcomes related to gun violence.
