The latest news on school shootings
Security measures implemented after Columbine shooting kept casualties to a minimum.
Adding more police officers won't prevent school violence.
One student was seriously wounded in Arapahoe, Colo., school shooting.
Sandy Hook Elementary School massacre 911 tapes revealed.
Sandy Hook Elementary School shooter suffered from mental illness, got little help.
The incident remains under investigation by the Lynchburg Police Department.
Suspect Philip Chism may have used a box cutter to kill Colleen Ritzer in a girls' bathroom.
Danvers high school student charged for murdering teacher.
A middle school math teacher was fatally shot, but two other victims are expected to survive.
Two people, including the shooter, have died, while two more minors are in critical condition.