President Barack Obama receives an update on the explosions that occurred in Boston, in the Oval Office, April 16, 2013. Seated, from left, are: Homeland Security Secretary Janet Napolitano; Tony Blinken, Deputy National Security Advisor; Jake Sullivan, National Security Advisor to the Vice President; Attorney General Eric Holder; Lisa Monaco, Assistant to the President for Homeland Security and Counterterrorism; Chief of Staff Denis McDonough; and FBI Director Robert Mueller. (Official White House Photo by Pete Souza)