The federal probe of poisoned letters sent to President Obama and others has taken an abrupt change of course. On Tuesday, U.S. prosecutors dropped charges against the Mississippi man first arrested in the case. FBI agents have taken their search for clues to another man's house in Tupelo.
In Boston on Tuesday, residents and business owners on Boylston Street were allowed to return for the first time since last week's bombings. They returned to stores with windows blown out, restaurants with the remains of uneaten meals still sitting on tables and barricades to keep the public away from the scene.
Under current laws, if a background check shows your name is on the national terror watch list, you can still purchase a gun. Government data show that people on terrorism watch lists were able to buy guns or explosives after a background check more than 1,300 times between 2004 and 2010.
Investigators are trying to determine if the bombing suspects acted alone. The bombs that exploded at the marathon were simple and similar to ones law enforcement officials come across on a regular basis.
Robert Siegel speaks with Peter Bergen, CNN's national security analyst and author of Manhunt: The Ten-Year Search for Bin Laden — from 9/11 to Abbottabad, about the alleged link between al-Qaida and Iran.
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