In 2024, President Joe Biden gave a speech to mark the 25th anniversary of the Columbine massacre. In that speech, he said more than 400 school shootings have taken place since Columbine, exposing ...

April 20, 1999 – At approximately 11:19 a.m., two students, Klebold, 17, and Harris, 18, carrying guns and bombs, open fire inside Columbine High School, killing 13 and wounding 23 others before ...