Schools focus on "hardening" buildings against mass shootings. Data show they're missing where most gun violence is happening.

"Pure chaos" is how students at Garfield High School in Seattle described the shooting scene they encountered when they returned to campus from lunch in June. 17-year-old Amarr Murphy-Paine died after he was shot while trying to break up a fight near the school steps.

"I mean, people were running that way, this way," Nate Cook recalled.

Garfield High School has been the scene of five shootings since 2021. It's the most at any single U.S. school in the last 20 years, according to a CBS News data analysis.