Today's Situation Room:

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.

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.

April 17th, 2013
07:01 PM ET

Gov. Patrick: No one in custody

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

April 17th, 2013
06:57 PM ET

Obama: Gun lobby 'willfully lied'

President Obama criticized the NRA and a group of senators for blocking an expansion of background checks for gun sales.

RELATED STORY: Senate rejects expanded gun background checks


Filed under: Barack Obama • Guns
April 17th, 2013
06:46 PM ET

The medical effects of ricin

CNN's Sanjay Gupta explains ricin and how deadly the poison can be.

RELATED STORY: Ricin scare rattles Washington


Filed under: Ricin • Sanjay Gupta
April 16th, 2013
08:33 PM ET

Source: Bombs were in pressure cookers

CNN's Joe Johns looks at the nature of the explosives used in the Boston Marathon blasts.

RELATED: FBI releases new details on Boston bombs


Filed under: Boston Marathon bombings • Joe Johns
April 16th, 2013
08:26 PM ET

Letter laced with ricin sent to Senate

A suspicious letter containing ricin, a poison, was addressed to a senator, according to sources. CNN's Dana Bash reports.

RELATED STORY: Ricin scare rattles Washington


Filed under: Capitol Hill • Dana Bash • Ricin
April 16th, 2013
07:09 PM ET

Third victim was a B.U. grad student

CNN's Wolf Blitzer reports the third victim in the Boston Marathon attack was a Boston University graduate student.

RELATED STORY: Sadness, resolve as Boston comes to grips with deadly marathon bombing

April 16th, 2013
06:17 PM ET

Bombing victim's mom: Everyone loved her

Patty Campbell says Monday's terror attack in Boston doesn't make any sense. Her daughter, Krystle, died in the bombing.

RELATED STORY: 'Boston will overcome,' mayor vows amid bombing investigation

April 15th, 2013
11:07 PM ET

Boston Marathon terror attack analyzed

CNN's Tom Foreman takes a closer look at how and where Monday's terror attack in Boston occurred.

RELATED STORY: Boy, 8, one of 3 killed in bombings at Boston Marathon; scores wounded


Filed under: Boston Marathon bombings • Terror • Tom Foreman
April 15th, 2013
11:05 PM ET

Obama: We will get to the bottom of this

President Obama reiterated that investigators do not yet know who is behind the explosions in Boston.

RELATED STORY: Boy, 8, one of 3 killed in bombings at Boston Marathon; scores wounded


Filed under: Barack Obama • Boston Marathon bombings • Terror
April 15th, 2013
11:02 PM ET

Watch Boston Marathon explosions

A photographer captured the two explosions at the Boston Marathon up close.

RELATED STORY: Boy, 8, one of 3 killed in bombings at Boston Marathon; scores wounded


Filed under: Boston Marathon bombings • Terror
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