Images of terror run repeatedly on television, computer screens
Phone companies: Cellphone use heavy, but still operating in Boston after explosions
Upcoming events, from London Marathon this Sunday to Indy 500 in May, will examine security
Russia ponders security lessons from Boston marathon for Moscow track event, Sochi Olympics
WTOP's Bob Madigan reports
Obama says Boston culprits will 'feel weight of justice;' officials call explosions terrorism
Bombs shatter marathon on what had been a triumphant day for Lelisa Desisa, Rita Jeptoo
Intelligence official: 2 more explosive devices found at Boston Marathon; being dismantled
Mass. gov.: No unexploded bombs found at marathon, police say 176 hurt, 3 dead
Despite heading-off many potential terrorist events in the years since Sept. 11, 2001, the bombing at the Boston Marathon points out local, state, and federal law enforcers can't prevent every attack.
Russia's Putin offers US help with investigating Boston bombings
"I run for Boston." So many marathoners have declared that line over the years while training to achieve a qualifying time for what is considered the Holy Grail of American marathons.
I qualified to run the 2013 Boston Marathon. Up until this past February, the plan was for my husband and daughters to make the event a family trip where they would cheer me at the finish line like they have for other races.
78-year-old Washington state runner knocked down by blast, caught in viral photo
A look at teams and sporting events impacted by attacks
Marathon day in Boston is a day traditionally filled with eager runners, packed bars and sidewalks overflowing with supporters, signs and cheers. But the 117th Boston Marathon deviated drastically from tradition.
After the bombings in Boston, Southwest Airlines is letting passengers reschedule their flights.
Witnesses describe hearing Boston Marathon explosions, the chaos of bloody bombing scene
Jordan Muslim extremist 'happy' over Boston bombing
AP PHOTOS: 2 bombs explode at Boston Marathon finish line