Defense Secretary Hagel calls Boston bombings 'cruel act of terror'
From Boston to the Bay Area, runners show support for bombing victims _ by going out to run
Boston Marathon bombings raise security fears for Olympics, World Cup and other events
Emergency radio scans of first minutes of Boston bombings testify to police, medic heroics
In aftermath of Boston bombing, 'who?' and 'why?' remain unanswered questions
Following the Boston Marathon bombings, people across the country are asking how they can help victims and the city of Boston recover.
Since the 2001 terror attacks, surveillance cameras on buildings, light fixtures and utility poles have popped up like mushrooms after a summer rain.
Security around the world reassessed after deadly bombings at Boston Marathon
Boston bombing traced to pressure cookers packed with shrapnel; motive a mystery
Obama says Boston bombings were cowardly acts that won't 'get in the way of our lives'
A look at the bombing at the Boston Marathon and the search for suspects
Boston Marathon organizers vowed to continue the race next year, calling the world's oldest and most prestigious annual marathon "a deeply held tradition (and) an integral part of the fabric and history of our community."
Security in Washington-area transit and on the roadways is at a heightened level after the explosions in Boston.
Neighbors recall Boston bombing victim as vivacious 8-year-old who loved to run, climb
Person briefed on probe: Boston explosives were in pressure cookers, hidden in duffel bags
For Boston, a day of longstanding tradition and pride dissolves into chaos and tears
Egypt's Muslim Brotherhood condemns Boston Marathon bombings, deems them 'sinful'
Reporter shares account of hearing bomb blasts go off while covering his 18th Boston Marathon
Washington-area hospitals have learned a lot since the attacks on the Pentagon. And they say they are prepared to handled another mass-casualty event.
The District of Columbia's Emancipation Day parade went on as planned a day after two bombs exploded in Boston near the finish line of the city's marathon.