We check in on developments in Boston as the city reels from explosions near the finish line of Monday's Boston marathon. How prepared is California for a similar emergency? We'll also assess the nation's efforts to prevent acts of terror.
Explosions at the Boston Marathon
Dean Karnazes, ultramarathon runner who ran the Boston marathon and author of "RUN! 26.2 Stories of Blisters and Bliss"
Michael Nacht, professor of public policy at UC Berkeley and former assistant secretary of defense for global strategic affairs
Mark Ghilarducci, secretary of the California Emergency Management Agency
Brian Michael Jenkins, leading terrorism authority with the Mineta Transportation Institute and the RAND Corporation
Martha Bebinger, reporter for WBUR, an NPR affiliate in Boston
Beth Goldstein, San Franciscan who ran the Boston marathon yesterday