Have All Attackers in U.S. School Shootings Been Men?

On March 27, 2023, a shooter entered The Covenant School, a private Christian school for preschool to sixth grade, and opened fire, killing six, as reported by The New York Times shortly after the event:

A heavily armed woman entered a Christian school in Nashville on Monday morning and fatally shot three children and three staff members before she was shot and killed by the police, a spokesman for the Metropolitan Nashville Police Department said.

The spokesman, Don Aaron, said that investigators were working to identify the woman who had opened fire...