Wolf Blitzer delivers the most important breaking news and political, international, and national security stories of the day. Tune to The Situation Room weekdays 5-7pm ET on CNN.
CNN's Wolf Blitzer talks to Massachusetts Gov. Deval Patrick about the ongoing bombing investigation in Boston.
RELATED STORY: Sources: Possible suspect sought in Boston bombing
CNN's Wolf Blitzer reports the third victim in the Boston Marathon attack was a Boston University graduate student.
Patty Campbell says Monday's terror attack in Boston doesn't make any sense. Her daughter, Krystle, died in the bombing.
CNN's Tom Foreman takes a closer look at how and where Monday's terror attack in Boston occurred.
President Obama reiterated that investigators do not yet know who is behind the explosions in Boston.
A photographer captured the two explosions at the Boston Marathon up close.