• Boston Bomb Video Spots 'Person of Interest'  Thursday, 18 Apr 2013 | 7:05 AM ET

    CNBC's Scott Cohn reports the latest details on the investigation into the Boston Marathon bombing.

  • Video Spots 'Person of Interest' in Boston Bombing  Thursday, 18 Apr 2013 | 6:05 AM ET

    CNBC's Scott Cohn reports the latest details on the investigation into the Boston Marathon bombing.

  • CNBC's Eamon Javers reports Capitol Hill staffers got an email alert by police to avoid the third floor of the Hart Senate Office building. Authorities say they might know who sent the letters, reports CNBC's John Harwood.

  • Hunt For Boston Bomb Suspects Wide Open: FBI  Wednesday, 17 Apr 2013 | 11:36 AM ET

    New details are emerging about the type of device used in Monday's bombing in Boston, reports CNBC's Scott Cohn.

  • Boston Crime Scene Photos Show Twisted Remains of Device  Wednesday, 17 Apr 2013 | 10:10 AM ET

    Investigators appear no closer to finding a suspect but are learning more about the bombs used, reports CNBC's Scott Cohn.

  • 'Soft Targets' Concern Security Experts  Wednesday, 17 Apr 2013 | 8:32 AM ET

    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.

  • Boston Bombs Believed Packed in Pressure Cookers  Wednesday, 17 Apr 2013 | 8:03 AM ET

    CNBC's Scott Cohn reports the type of devices used in Monday's bombing in Boston are beginning to emerge.

  • Federal Agents Zero In on Bomb's Charred Remains  Wednesday, 17 Apr 2013 | 7:32 AM ET

    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.

  • Congress Reacts to Ricin Letter & Boston Bombings  Wednesday, 17 Apr 2013 | 7:10 AM ET

    CNBC's Eamon Javers has the latest details on a ricin-tainted envelope sent to the office of Sen. Roger Wicker (R-MI). Sen. Jack Reed (D-RI) and Sen. Angus King (I-ME) discuss a poison-laced letter sent to Capitol Hill, as well the Boston Marathon bombings.

  • Poison Laced Letter Sent to US Senator  Wednesday, 17 Apr 2013 | 6:10 AM ET

    A ricin-tainted envelope was sent to the Capitol Hill office of Sen. Roger Wicker, (R-MI), reports CNBC's Eamon Javers.

  • Boston Bombs Possibly Delivered in Black Duffle Bags  Wednesday, 17 Apr 2013 | 6:04 AM ET

    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.

  • Security Lockdown for Thatcher's Funeral  Wednesday, 17 Apr 2013 | 1:39 AM ET

    CNBC's Ross Westgate reports on the huge security operation ahead of the funeral of former UK Prime Minister Baroness Thatcher.

  • National Security in Washington Spotlight  Tuesday, 16 Apr 2013 | 1:45 PM ET

    The latest on the terror events in Boston and how the nation's capital is responding, with CNBC's Eamon Javers.

  • All Clear at Logan Airport After Security Search  Tuesday, 16 Apr 2013 | 11:38 AM ET

    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.

  • London Prepares For Thatcher's Funeral & Marathon  Tuesday, 16 Apr 2013 | 11:13 AM ET

    Large events around the globe are affected by the tragic events in Boston, reports CNBC's Tom Mackenzie.

  • Boston Tragedy 'Not a Surprise': Security Expert  Tuesday, 16 Apr 2013 | 10:15 AM ET

    The "sort of attack" we saw in Boston, feels like the kind of attacks we've been seeing in the past 10 years or more, said, Stewart Baker, Steptoe and Johnson partner. "We are going to find these folks, the Bureau is really good at dealing with this kind of evidence and crime scene," he added.