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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.
President Obama expressed confidence the FBI and other agencies are investigating the deadly Boston Marathon bombing, reports CNBC's Bertha Coombs.
Discussing how the Boston Marathon tragedy impacted the stock market, and what other catalysts are weighing on stocks, with Art Cashin of UBS; Joe Greco, Meridian Equity Partners; and the "Power Lunch" crew.
Boston is feeding and sheltering those affected by Monday's terror. Plus, the Google document that's circulating, which offers stranded travelers free lodging and rides.
"There are no options taken off the table," said Michael Leiter, former Director of the National Counterterrorism Center, discussing how the bombings in Boston will impact domestic and global security measures.
CNBC's Bertha Coombs has the latest details on reopening of Boston's airport, as law enforcement officials continue to collect video from surveillance cameras and watch for a man seen leaving the scene after the blast.
We don't yet know who planned and executed this, said President Obama, but we will find who did this and bring them to justice. As we receive more information we will make sure to keep the American people posted, he added.
Mark McClelland, head of North America at Maplecroft, talks to CNBC about the Boston bombings and says there are still a lot of unanswered questions.
Arthur Hogan, Lazard Capital Markets, discusses what's likely driving the rebound in today's markets following the tragic events in Boston yesterday.
Large events around the globe are affected by the tragic events in Boston, reports CNBC's Tom Mackenzie.