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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.

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.

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.

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.

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.

Update On The Boston Marathon Bombings

President Obama makes a statement about Monday's explosions at the Boston Marathon. Morning Edition co-hosts David Greene and Steve Inskeep speak to NPR reporters covering the story in Washington and Boston.

What We Know About 'The Act Of Terrorism' In Boston

Less than 24 hours after two explosions rocked the finish line at the Boston Marathon and there are still more questions than answers about what happened. Three people were killed and more than 170 were injured. The FBI is investigating the event as an act of terrorism.