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.
Source: Bombs were in pressure cookers
CNN's Joe Johns looks at the nature of the explosives used in the Boston Marathon blasts.
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
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
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
About this Show
The Situation Room with Wolf Blitzer is the command center for breaking news, politics and extraordinary reports from around the world. Tune in weeknights from 5-7pm ET on CNN.
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