Columbine Massacre Videos
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.
Mass shootings in the country have been increasing
Active shooter incidents are becoming more frequent and deadly in the country with the Las Vegas mass shooting now the deadliest shooting in modern history.
6 deadliest US school shootings since 1966
In a Virginia Tech dormitory a lone gunman shot and killed two people beginning what would become the deadliest shooting spree in US history. 32 were killed including the gunman 33 die and nation in shock. Schools should be places a safe. Keys sanctuary. Or sanctuary is violated. The impact from
Maryland teen plotting school shooting referred to Columbine , Newtown in diary, police say
A Maryland teen accused of plotting a school shooting mentioned the Columbine High School massacre and the Sandy Hook Elementary School shooting in a diary discovered by investigators, according to authorities.
Index: Police Praise Parent for Helping Prevent Possible Columbine -Style School Attack
ABC News' David Muir reports the stories people have been buzzing about all week.
Two Students Arrested for Alleged High School Shooting Plot
Two 16-year-olds are being held at Orange County Juvenile Hall in California.
Florida Middle School Students Accused of Plotting Columbine -Style Attack
The accused students are being held at a juvenile detention center and potentially face adult charges.