At least two homemade bombs detonated at the finish line of the Boston Marathon in Copley Square just before 3 p.m. today, setting off explosions that killed three people and injured more than 100, many of whom lost limbs. According to early reports, three other explosive devices were found nearby, one of which was set off by police in a controlled detonation (a simultaneous fire at the JFK Library is said to have been unrelated). There are no suspects in custody, but police are searching for a person of interest who tried to gain access to a restricted area just before the bombs went off.

Continuing Updates on the Marathon Bombing

The latest news on the bombing and the immediate aftermath. More »

President Obama: "Any Responsible People or Groups Will Feel the Full Weight of Justice"

President Obama held a no-nonsense press conference moments ago where he promised to bring any responsible parties to justice, but clarified that they had no information yet on who those responsible parties might be. More »

Air Space Over Boston Shut Down

A growing list of local and national safety precautions taken in the aftermath of this afternoon's Boston Marathon bombing. More »

Raw Videos of the Boston Marathon Explosions

Several videos have surfaced that show the original explosions and the chaotic scene that followed. More »

Photos from the Marathon Bombing

Photographs from the scene of the bombing, direct from the wire. More »

Patton Oswalt Pens Inspirational Missive on Humanity's Inherent Goodness in Wake of Boston Marathon Bombing

A comedian's heartfelt response to horror. More »