WATCH: At Columbine High School, students release balloons one at a time in honor of the 17 victims of the MS Douglas High shooting. #NationalWalkoutDay pic.twitter.com/bPOzrlOOPc— MSNBC (@MSNBC) March 14, 2018
WATCH: At Columbine High School, students release balloons one at a time in honor of the 17 victims of the MS Douglas High shooting. #NationalWalkoutDay pic.twitter.com/bPOzrlOOPc