The two blasts hit, killing three and wounding at least 176 people, as runners arrive at the Boston Marathon finish line ... photos and videos of the bombing stream onto Twitter, Facebook ...

Heavily armed FBI and police SWAT teams combed through Watertown, Mass. in a massive manhunt for Boston Marathon bombing suspect Dzhokhar Tsarnaev. Video: YouTube/Scott Sassone, YouTube/David Tamang.

We still don't know a lot of things about the Boston Marathon bombings and their aftermath ... handguns and a BB gun apparently used in the Watertown street fight and "an M-4 carbine rifle ...

The list of convicted killers granted clemency by the president does not include surviving Boston Marathon bomber ... who was killed during a Watertown shootout with police. Earlier this month ...

The Wall Street Journal reports on last night’s violence in Watertown ... Boston area in the hunt for one of two brothers of Chechen background suspected in Monday’s Boston Marathon bombings.

Police and bomb squads swarmed the area in one of the most significant responses to a bomb threat locally since the 2013 Boston Marathon bombing that killed three people and wounded 260 others.

Andrew Kitzenberg, the founder of OnHand, has published a stunning new firsthand account of Thursday's shootout in Boston between police and suspects Dzhokhar and Tamerlan Tsarnaev. Andrew gave us ...

Two classmates and a friend of Boston Marathon bomb suspect Dzhokhar Tsarnaev have been jailed on charges they tried to throw investigators off their friend's trail, federal prosecutors announced ...