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Massachusetts Gov. Deval Patrick said the state would be open for business, "but it will not be business as usual."
CNBC's Eamon Javers has the latest details on a ricin-laced letter sent to Sen. Wicker's office. And, Clark Ervin, former Homeland Security Department official; and Clint Van Zandt, former FBI profiler, discuss whether Monday's bombing leaves major events such as sporting, more vulnerable to future attacks.
Steve Bertoni, Forbes associate editor; and Rebecca Patterson, Bessemer Trust, share their investment strategies after gold's big dip; "squishy" earnings and possible downgrades in France and/or Germany.
CNBC's Scott Cohn reports the type of devices used in Monday's bombing in Boston are beginning to emerge.
Bomb fragments are being reconstructed at an FBI laboratory, reports CNBC's Scott Cohn. And, Philip Mudd, New America Foundation, discusses the psychological impact of terrorism and how to avoid copycat attacks.
CNBC's Scott Cohn reports the FBI and state and local law officials are intensifying their probe into Monday's bombing at the Boston Marathon, recovering two pressure cookers packed with nails and other metals.
Alexia Ash, head of North America at IHS, says the anonymity and the method used suggest the Boston Bombings were the act of a lone group.
The very latest on the ground in Boston, with WVIT's Debra Bogstie.
Discussing whether a domestic or foreign terrorist is responsible for the Boston Marathon bombings, with J. Michael Barrett, Diligent Innovations principal, and Heather Higgins, Independent Women's Forum.
CNBC's Bertha Coombs reports on the latest on the Boston bombings.
Security consultants say the entire calculus of protecting a marathon has changed, reports CNBC's Scott Cohn; and Gen. Barry McCaffrey, ex-National Security Council member, weighs in. "[These bombs] were not sophisticated foreign-made intelligence provided devices," says McCaffrey.
Former Mayor of New York City Rudy Giuliani, who guided his city through the Sept. 11 attacks, said any speculation in the case of the Boston marathon attacks would be a mistake.
Two explosions went off near the finish line of the Boston Marathon on Monday; 3 people died, and 176 people were hospitalized due to injuries, reports CNBC's Scott Cohn.
Social media has made an impact after the Boston bombings. There were more than 1.5 million tweets mentioning Boston just after 4:30 ET.
The tragedy at the Boston Marathon on Monday was a terrible reminder of our safety. David Ropeik, Ropeik & Associates, shares his opinions.
The finish line of a marathon is a high for runners, and of course that all changed in Boston yesterday, with CNBC's Scott Cohn.
The latest on the terror events in Boston and how the nation's capital is responding, with CNBC's Eamon Javers.
The deadly Boston Marathon bombings won't "change the way we live" in the United States, said Jack Jacobs, a retired U.S. Army colonel who received the Medal of Honor. "We haven't had attacks like they have in Europe."
Scenes from the Boston Marathon bombing catastrophe, one of the nation's worst attacks since Sept. 11, 2001.
The Boston Marathon bomb attacks had a fleeting impact on markets, but that could change, depending on what investigators uncover.