Columbine Massacre Videos
19 years after school shooting, Columbine students join in nationwide walkout for gun control
local time today gathered on the school's soccer fields with red, white and blue balloons.
Students to hold school walkout for gun control
Students plan to leave their classrooms for 17 minutes to remember the 17 victims of last month's Marjory Stoneman Douglas High School shooting in Parkland, Florida.
Shooting survivor describes emotional return to school
Leni Steinhardt, a Marjory Stoneman Douglas High School sophomore, and her father talk to "GMA" about returning to campus after the shooting.
The debate over arming teachers in the wake of Parkland shooting
Kasey Hansen, a special education teacher from Utah, and Columbine survivor Patrick Neville believe teachers should be armed in classrooms.
Trump open to stronger gun background checks, arming teachers
President Trump heard passionate pleas from survivors and families of school shooting victims, from Columbine to Parkland, during a listening session at the White House.
Florida school shooting survivors demand change during visit to state capital
Marjory Stoneman Douglas High School students met with legislators in Tallahassee, while others gathered at a rally.
Florida shooting is this year's 18th school-related shooting in the US
ABC News' Pierre Thomas reports on warning signs that are sometimes missed and what schools and law enforcement officials are doing to prepare.
What we know about deadly shooting at Florida high school
The suspect's name is Nikolas Cruz, 19, according to multiple law enforcement sources.
Parents of teen killed in Kentucky school shooting say daughter called mother
Bailey Holt, 15, was one of two students killed at Marshall County High School in western Kentucky on Tuesday after a classmate allegedly opened fire.
Sandy Hook: Five years later, victims' families find new purpose
Nicole Hockley, who lost her son Dylan, and Mark Barden, who lost his son Daniel, helped start Sandy Hook Promise with several other families who lost loved ones in the shooting.