Here's what scientists know about mass school shootings



When the Columbine High School massacre took place in 1999 (opens in new tab) it was seen as a watershed moment in the United States — the worst mass shooting at a school in the country’s history.

Now, it ranks fourth. The three school shootings to surpass its death toll of 13 — 12 students, one teacher — have all taken place within the last decade: 2012’s Sandy Hook Elementary attack (opens in new tab), in which a gunman killed 26 children and school staff; the 2018 shooting at Marjory Stoneman Douglas High School in Parkland, Florida, which claimed the lives of 17 people (opens in new tab); and now the Robb Elementary School assault in Uvalde, Texas (opens in new tab), where on May 24, 2022, at least 19 children and two adults were murdered.



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By GIL