STAN HONDA/AFP/Getty ImagesMassachusetts Governor Deval Patrick (L) speaks to the media at a shopping mall on the perimeter of a locked down area as a search for the second of two suspects wanted in the Boston Marathon bombings takes place on April 19, 2013 in Watertown, Massachusetts.
KPCC's up-to-date coverage on the Boston Marathon bombings
Steve Brown, reporter and anchor at WBUR in Boston.
Erroll Southers, Adjunct Professor of Homeland Security and Public Policy Associate Director, Center for Risk and Economic Analysis of Terrorism Events, USC
Hussam Ayloush, Executive Director of the greater Los Angeles office at the Counsel on American-Islamic Relations (CARE)
Olga Oliker, Associate Director, RAND International Security & Defense Policy Center and author of "Russian Foreign Policy." Born in Russia and fluent in Russian, Oliker's expertise includes Russian foreign policy and deterrence strategy.
Thomas Wieczorek, ICMA Center for Public Safety Management
Phil Mattingly, Justice Department Reporter, Bloomberg News