FILE PHOTO: People visit the Columbine memorial after teens kicked off a voter registration rally, a day ahead of the 19th anniversary of the massacre at Columbine High School, in Littleton, Colorado, U.S., April 19, 2018. REUTERS/Rick Wilking/File Photo
FILE PHOTO: People visit the Columbine memorial after teens kicked off a voter registration rally, a day ahead of the 19th anniversary of the massacre at Columbine High School, in Littleton, Colorado, U.S., April 19, 2018. REUTERS/Rick Wilking/File Photo