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Suspect Arrested In Poison-Laced Letters

The FBI has arrested a Mississippi man believed to be responsible for mailing three letters that, at least preliminarily, tested positive for the poison ricin. They were addressed to President Obama, Senator Roger Wicker of Mississippi and a judge in Mississippi.
NPR

FBI Focuses On Photos For Clues To Marathon Bomber

The investigation into the Boston Marathon bombing is ongoing. Investigators are examining photos and videos and testing physical evidence recovered from the scene. Without any official news, speculation has been rampant.
NPR

More Prisoners Join Hunger Strike At Guantanamo

The number now stands at 52, the U.S. military says. The news comes just days after guards raided a section of the facility to move prisoners to single cells from their communal holding area because the detainees had covered security cameras.
NPR

Why Use A Pressure Cooker To Build A Bomb?

Pressure cooker bombs have long been used in places such as Afghanistan and Pakistan because they are cheap, easy to build and inconspicuous. They rely on basic principles of physics to amplify their explosive power.
NPR

Guantanamo Bay, One Piece Of Torturous Puzzle?

Several Guantanamo Bay detainees are on a months-long hunger strike. But the U.S. may have bigger problems when it comes to detainee treatment. A bipartisan study says it's undeniable that the U.S. tortured people after 9/11. Host Michel Martin speaks with former Congressman Asa Hutchinson, a Republican, and one of the co-chairs of the study.
NPR

Boston Blasts Remind Us Of Fragility Of Life

The attack in Boston makes us think about our own vulnerability. Psychologists have used the Sept. 11 terrorist attacks and other tragedies to track the arc of recovery from this kind of incident.
NPR

Security Expert: Investigators Seeking Bomber's 'Signature'

An expert on terrorism and security says investigators in Boston are looking for minute clues in bomb debris that could point to a suspect, and also turning to race spectators who might have captured evidence. "That was one of the most photographed sites on the planet yesterday," he said.

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