Chechen? American? Immigrant? Citizen? Muslim? Boston Marathon bombing suspects Tamerlan and Dzhokhar Tsarnaev may be all of the above, but how Americans attempt to come to grips with the attacks allegedly perpetrated by the brothers has much to do with how Americans identify them. ...

The CIA pushed to have one of the suspected Boston bombers placed on a U.S. counterterrorism watch list more than a year before the attacks, U.S. officials say.

The two brothers suspected of bombing the Boston Marathon appear to have been motivated by a radical brand of Islam but do not seem connected to any Muslim terrorist groups, U.S. officials say after interrogating and charging Dzhokhar Tsarnaev with crimes that could bring ...

Within hours of the Boston Marathon bombing, investigators were already overwhelmed. Bloody clothing, bags, shoes and other evidence from victims and witnesses was piling up. Videos and still images, thousands of them, were pouring in by email and Twitter. Quickly, the authorities secured a ...

The Sept. 11, 2001, attacks led to a massive buildup of security to make the country safe. Subsequent plots, including attempts to conceal bombs in shoes and underwear, prompted hasty additions to that edifice, as officials sought to fill in cracks that terrorists might ...

Boston bombing suspect Dzhokhar Tsarnaev hangs onto life as investigators prepare to question him about the devastating attack on the Boston Marathon.

While dark details about Boston bombing suspects Dzhokhar and Tamerlan Tsarnaev will likely emerge at some point, so far their motives remain a mystery.

The FBI released video and photos Thursday of two suspects in the Boston Marathon bombings who were seen carrying backpacks and walking casually among spectators shortly before the blasts. Officials hope that publicizing the images, culled from a trove of digital information, will help ...

The bombs that tore through a crowd of spectators at the Boston Marathon could have cost as little as $100 to build and were made of the most ordinary ingredients — so ordinary, in fact, that investigators could face a gargantuan challenge in attempting ...

Troubling anniversaries linked to U.S. extremists have fueled speculation about who is behind the Boston bombings even though investigators have yet to publicly cast blame on any culprits. The twin bombs left at the marathon’s finish line Monday, which killed three people and wounded ...