The Secret Service released a profile Thursday that shared overlapping personality and physical characteristics of the 28 people who carried out “mass attacks” in public places in the United States in 2017, including the finding that all were male.

The average age of the 28 assailants was 37, and all attackers fell between 15 years old and 66 years old, the Secret Service National Threat Assessment Center’s Mass Attacks in Public Spaces report concluded.

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