The scrolling list of online student activities for Tuesday, April 20, lists a spring play rehearsal, a talk by "famous photographer, John Fielder" -- and "NO SCHOOL."
A 15-year-old boy remained in a psychiatric facility Tuesday after Monroe, New York, police arrested him in connection with a plot to attack his former high school on the anniversary of the 1999 Columbine High School shooting, police said.
Dramatic closing arguments are presented in the trial of alleged murderer Alvaro Castillo.
A man who was obsessed with the Columbine High School massacre was found guilty of murder Friday and sentenced to life without parole for gunning down his father before opening fire at a North Carolina high school three years ago.
Jennifer Muzquiz was "goth" in high school. She had, and still has, multicolored hair, a "face full of piercings," and an all-black wardrobe, even though she no longer identifies with the goth subculture. And while her style had always earned her her fair share of strange glances, she says everything changed for the worse after the Columbine school shootings on April 20, 1999.
iReporters express their thoughts on the 10th anniversary of the Columbine high school tragedy, on HLN.
Several thousand people poured into the amphitheater at Robert F. Clement Park Monday for an event memorializing the victims of the Columbine shootings on the 10-year anniversary of that tragic event.
What do you remember about April 20, 1999?
Littleton, Colorado marks the 10th anniversary of the Columbine High School shooting.
New Life Church shooting victim Larry Bourbonnais talks to CNN's Anderson Cooper about what happened.
Matthew Murray, the man who police say shot and killed four people at two separate locations in Colorado on Sunday, died from a self-inflicted gunshot wound, the coroner's office said Tuesday.
Matthew Murray wrote on an Internet forum of how he hated Christians between attacks on a mission center and church on Sunday, according to Denver-area media reports.
A college student embarks on a shooting spree, taking 32 lives. A teenager with an assault rifle opens fire on holiday shoppers in a department store in middle America. And, long before that, two youths turn the halls of their high school into a virtual abattoir, leaving some 13 dead before killing themselves.
CNN's Gary Tuchman looks at mall shooter Robert Hawkins' behavioral problems and possible red flags.
An 18-year-old authorities say shot eight people inside his high school in southern Finland, before turning the gun on himself, has died, police said.
Kacey Ruegsegger Johnson wants the Virginia Tech shooting survivors to know that their pain and anger and fear are normal. And she wants them to know it will get better.
The oldest of five students charged in what prosecutors call a failed plot at a Kansas high school can be released under house arrest after his parents post a $50,000 bond, the judge ruled during a hearing Monday afternoon.
A public memorial and candlelight prayer vigil marks Tuesday's five-year anniversary of the Columbine High School shootings. On April 20, 1999, two students, Dylan Klebold and Eric Harris killed 12 of their classmates, a teacher and then themselves.