Boston Marathon Bombing Videos
Shalane Flanagan reacts to making history at NYC Marathon
Flanagan, 36, told "GMA" she is still in shock after becoming the first U.S. woman to win the marathon in 40 years.
Man goes on mission to behead police officers for ISIS: Part 4
Usaamah Abdullah Rahim was killed by Boston police, and his nephew David Wright was found guilty of conspiring to provide support to ISIS and other charges.
Law enforcement experts on the impact of social media on crime, terrorism and national security
Good morning everyone I'm on in his eyes thanks for being with us today we are at Rutgers University live. For an incredible moderated discussion we're really pleased to host on social media crime and terrorism. And national security the Easter of course stories we've been covering many times over
Inside the FBI bomb squad
An exclusive look at how investigators are trained to spot clues in the aftermath of an explosion.
New park honors 8-year-old killed in Boston Marathon bombing
The park, next to the Boston Children's Museum, is expected to open in the fall of 2018.
Tourniquets during mass-shooting situations are crucial
Bystanders were able to quickly apply tourniquets to the gunshot wound victims after the Virginia shooting, possibly preventing their injuries from becoming more serious.
Manchester Arena bombed in terror attack
Self. And want to start by Samad our hearts go out to everyone impacted by yesterday's. Terrorist attack in Manchester 22 people lost their lives after bomb was detonated act and I admit. I Rihanna funding concert. And of course I assistance claiming responsibility. And you know there's so many
Army Nat'l Guard vet carries woman across Boston Marathon finish line
U.S. Army National Guard veteran, who lost his leg when his vehicle was hit by a roadside bomb in Afghanistan, carries his friend across the finish line of the Boston Marathon.
April 15, 2013 : Boston Marathon bombing special report
ABC News' George Stephanopoulos reports on two explosions near the finish line of the premier race.
Missouri man accused of plotting President's Day terror attack
Robert Hester Jr. had allegedly posted ISIS propaganda and was arrested for allegedly planning a bombing spree targeting buses, trains and a train station in Kansas City, according to the FBI.