Nearly all U.S. mass attackers were male and faced major life stressor, report finds

A new report from the U.S. Secret Service analyzes 173 mass attacks that took place in the country from 2016-2020. It comes just days after two shootings in California – in Monterey Park and Half Moon Bay – killed 18 people. Shown here is a mourner at a candlelight vigil for victims of the mass shooting at a dance studio in Monterey Park, Calif. (Qian Weizhong/VCG via Getty Images)

The U.S. Secret Service has released a first-of-its-kind report that analyzes 173 mass attacks that took place in the country from 2016-2020.

It's the first time the agency has put together trends collected from five years of data; the report examines everything from when in the year the attacks took place, to behavioral changes exhibited in the attackers. The report, which comes from the agency's National Threat Assessment Center, looked at attacks that harmed at least three individuals, not including the attacker.