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Who might be behind the Boston bombings? Former FBI profiler Clint Van Zandt, offers insight.
CNBC's Scott Cohn reports the latest on the Boston bombings investigations; and Robert McFadden, Soufan Group and Bob Liscouski, Former Assistant Secretary for Homeland Security, provide perspective.
The latest on the investigations of the ricin scare on Capital Hill. CNBC's Eamon Javers reports on letters possibly poisoned with ricin that were sent to President Obama and Senator Roger Wicker.
The "all clear" has been given after the Federal courthouse in Boston was searched because of bomb threats, reports CNBC's Sue Herera.
CNBC's Scott Cohn breaks down today's investigation into the Boston attacks.
Authorities scouring the scene—on the ground and on rooftops—were able to gather significant evidence into the Boston Marathon bombing. Here are images of some of what they found.
CNBC's Eamon Javers reports on the concern on Capitol Hill over suspicious letters sent to the President and a Senator.
Discussing the fear in the markets, with Joseph Greco, Meridian Equity Partners and CNBC's Jeff Cox.
Federal officials tell NBC the Federal courthouse in Boston have been evacuated due to an unrelated bomb threat.
Giuliani Partners CEO Rudy Giuliani discusses the investigation of the Boston bombings, and what to make of the mixed news reports of an arrest.
The Federal courthouse in Boston is being evacuated, reports CNBC's Sue Herera.
The latest action in the market, with Michael Gayed, Pension Partners; Kenny Polcari, O'Neil Securities; Peter Andersen, Congress Asset Management; and CNBC's Rick Santelli.
It does appear there is video of a person placing a black bag at the site of the explosions, reports CNBC's Scott Cohn.
Discussing how the law enforcement message in the Boston bombings case was so muddled, with Robert Strang, Investigative Management CEO.
The FBI has knocked down the story of an arrest in the Boston bombings, reports CNBC's Scott Cohn.
Steve Massocca of Wedbush Securities, offers insight on the markets recent volatility.
Boston police report there has been no arrest made in the Marathon bombings, with CNBC's Eamon Javers and Bill Martel, Tufts University Associate Professor of international security. CNBC's Scott Cohn, offers insight.
Boston police tweeted there has been no arrest in the marathon attack, reports CNBC's Bill Griffeth.
CNBC's Brian Sullivan speaks to NBC News Terrorism Expert Bob Windrem about the investigation of the Boston bombing. Windrem says it is very clear at this point there has not been an arrest. Fred Burton, Stratfor, weighs in.
CNBC's Bill Griffeth reports NBC is saying authorities have "solid leads" in the Boston bombing. (1:28)