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.

May 30th, 2013
07:00 PM ET

Suspicious letter to Obama intercepted

A letter addressed to President Obama might be related to the laced letters sent to NY Mayor Bloomberg.

RELATED STORY: Letter to Obama intercepted; similar to ricin-laced letter to Bloomberg


Filed under: Barack Obama • Jim Acosta • Michael Bloomberg • Ricin
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
08:26 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