Chris Jansing anchors Jansing & Co. live from Boston Tuesday, where explosions rocked the finish line of Monday's Marathon.
Tune in to msnbc at 10 AM ET for interviews with witnesses and elected officials, including Rep. John Tierney of Massachusetts and Rep. Bennie Thompson, who serves on the House Homeland Security Committee.
msnbc Analysts Michael Leiter and lint Van Zandt will weigh in on the difficulty of preventing attacks at large-scale events like the Boston Marathon.