Guns On Campus Videos
Two Students Arrested for Alleged High School Shooting Plot
Two 16-year-olds are being held at Orange County Juvenile Hall in California.
'TrumpLand,' Michael Moore's October Surprise
Michael Moore's new surprise documentary "Trumpland" was released without warning and without promotion. Still it quickly shot to number one on iTunes and is sending shock waves across the political landscape. Here's my "Nightline" coanchor juju Chang for more of our series "Inside the final 30."
After Orlando Massacre, Interest in Guns in LGBT Community Rises
Pulse nightclub shooting that killed 49 people was seen as a terrorist act and a hate crime, leading many gays and lesbians to buy guns for protection.
How Columbine Killers Dylan Klebold, Eric Harris Were Different: Part 2
Experts who have studied the Columbine massacre talk about what set both boys apart and missed warning signs.
Republican Presidential Debate
GOP presidential candidates meet head to head in the last debate before the New Hampshire primary.
Donald Trump Says Ted Cruz Is Not Eligible to Be President
The women of "The View" discuss Donald Trump's recent claims about fellow candidate Ted Cruz.
President Obama's Emotional Reaction to Oregon College Shooting
The president said mass shootings have become "routine" after Umpqua Community College shooting.
Why Vester Flanagan, Now Bryce Williams, Was Fired From WDBJ
Part 3: Former colleagues at the Roanoke TV station describe the events leading up to Flanagan's dismissal.
What It's Like Inside a School Shooting Drill
Some parents became angry when their children were terrified during a Florida middle school's drill.
Columbine's Chilling Legacy
ABC News' Pierre Thomas examines the trend of Columbine copycats and how a fascination with the killers has created a dangerous subculture.