On April 20, 1999, two students, Eric Harris and Dylan Klebold, carried out a mass shooting at Columbine High School in Littleton, Colorado. They killed 12 students and one teacher before taking their own lives. The attack was one of the deadliest school shootings in U.S. history and led to widespread media coverage. The event spurred national debates about gun control, mental health, and school safety. In the years that followed, many schools implemented stricter security measures and active shooter drills.