Gun control advocates identified 156 mass shootings in the United States over the past eight years.

Everytown for Gun Safety, which is backed by former New York City Mayor Michael Bloomberg, published an analysis Tuesday that said 848 people were killed and another 339 were injured during U.S. mass shootings from 2009 to 2016.

The figures do not include the 66 mass shooters who turned the gun on themselves, or the 17 shooters killed by police, according to Everytown.

High-profile mass shootings in public places such as an Orlando nightclub or Sandy Hook Elementary School often garner the most attention. But the study found that more than half of the mass shootings it tracked were a result of domestic violence in the home.

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"The phrase 'another mass shooting' should not be a common expression," said Shannon Watts, founder of Moms Demand Action for Gun Sense in America, which works closely with Everytown to fight gun violence.

The figures are based on Everytown’s analysis of FBI crime data and news reports. Only shootings where at least four people were killed were considered mass shootings, for the purposes of the report.

Everytown said this is not an exhaustive list of mass shootings, as there could have been other cases that went unreported and were not included in their study.

The report comes one day after three people — including an 8-year-old — were shot in a California elementary school in an act that authorities believe was related to a "domestic dispute."