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

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.

The report comes just days after two shootings in California in Monterey Park and Half Moon Bay killed a total of 18 people. So far in 2023, there have been 39 mass shootings.

Lina Alathari, chief of the National Threat Assessment Center, said she hopes the research and guidance provided in the report can help prevent future mass attacks.

"We must do everything we can to prevent these, which is why we're putting out this research for you. There is no community that is immune from this," Alathari said.