Discuss as:

Programming notes

*** Tuesday’s “The Daily Rundown” line-up: NBC’s Michael Isikoff and Pete Williams with the latest on the investigation… Former Senate Homeland Security Committee Chairman Joe Lieberman (I-CT) on how security has changed since 9/11… Former Director of the National Counterterrorism Center and NBC News terrorism expert Michael Leiter… NBC News/msnbc senior political analyst and former Obama strategist David Axelrod on the president’s reaction and handling of this security situation… Plus live coverage of the latest update from law enforcement officials in Boston at 9:30amET.

*** Tuesday’s “Jansing & Co.” line-up: Chris Jansing, reporting live from Boston, interviews Rep. John Tierney (D-MA), Homeland Security  Committee Member Rep. Bennie Thompson (D-MS), the Boston Globe’s Matt Viser, Morning Joe’s Mike Barnicle, NBC News Terrorism Expert Michael Leiter, Fmr. FBI profiler Clint Van Zandt, and eyewitness Brent O’Connor.

*** Tuesday’s “MSNBC Live with Thomas Roberts” line-up: MSNBC’s Thomas Roberts interviews former Rep. Barney Frank (D-MA) and Sen. Chris Murphy about the terror attack in Boston. He’ll be joined by Fmr. Director of the National Counterterrorism Center Michael Letter,  Fmr. FBI Profiler Clint Van Zant, and Retired FBI Agent and Bomb Expert Rick Hahn. And Thomas also will talk to Boston Marathon Eyewitness Serdar Ozturk about what happened when the bombs exploded.

*** Tuesday’s “Andrea Mitchell Reports” line-up: NBC’s Andrea Mitchell interviews Boston marathon bombing eyewitness Serdar Ozturk, Rep. Richard Neal (D-MA), Rep. Peter King (R-NY), NBC Terror Analyst Michael Leiter and USA Today’s Tom Beusse and Susan Davis.