USA TODAY15 Years After Columbine, Are Schools Any Safer?Boise State Public RadioThis is TELL ME MORE from NPR News. I'm Celeste Headlee. Michel Martin is away. This Sunday marks the 15th anniversary of the shootings at Columbine High School. That day, two students opened fire and killed 13 people. And the tragedy put school ...Timeline: Deadly school shootings since ColumbineUSA TODAYall 7 news articles »