In this official White House photo, President Barack Obama is shown discussing developments in the Boston Marathon bombing investigation with members of his national security team on Friday in the Situation Room of the White House.
Pictured in the photo, from left: FBI Director Robert Mueller; Lisa Monaco, Assistant to the President for Homeland Security and Counterterrorism; Attorney General Eric Holder; Deputy National Security Advisor Tony Blinken; and Vice Persident Joe Biden.
(Official White House Photo by Pete Souza)