Personal, domestic or workplace disputes sparked half of mass attacks in the United States from 2016 to 2020 according to research from the U.S. Secret Service.
Nearly all of the attacks were carried out by men and a quarter were driven by conspiracy theories or hateful ideologies.
The report aims to prevent violence by identifying warning signs and comes days after a pair of mass shootings in California took the lives of 18 people.
Kate Fisher reports from Washington
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