White House

SECURITY_11331

An officer can be seen patroling the roof of the White House after bombs explode at the finish line of the Boston Marathon, Washington, D.C., Monday, April 15, 2013. Police have moved visitors to the north lawn of the White House back across the street as a precaution. (Andrew Harnik/The Washington Times)

SECURITY_11330

An officer can be seen patroling the roof of the White House after bombs explode at the finish line of the Boston Marathon, Washington, D.C., Monday, April 15, 2013. Police have moved visitors to the north lawn of the White House back across the street as a precaution. (Andrew Harnik/The Washington Times)

SECURITY_11329

Students from Bolder, Colo. stand behind police tape after police block off Pennsylvania Ave., from pedestrian traffic in front of the White House as a precaution after bombs explode at the finish line of the Boston Marathon, Washington, D.C., Monday, April 15, 2013. (Andrew Harnik/The Washington Times)

Obama_Boston_Marathon_Exp#2.JPG

President Barack Obama speaks in the James Brady Press Briefing Room at the White House in Washington, Monday, April 15, 2013, following the explosions at the Boston Marathon. (AP Photo/Charles Dharapak)

OBAMA15.jpg

President Barack Obama waves at the end of a ceremony honoring the BCS National Champion University of Alabama Crimson Tide at the White House in Washington, Monday, April 15, 2013. The White House says Mr. Obama has been notified about the explosions at the finish line of the Boston Marathon. (AP Photo/Manuel Balce Ceneta)

Obama_Live.jpg

White House spokesman Jay Carney speaks during the daily briefing at the White House in Washington on April 15, 2013. (Associated Press)

Obama Medal of Honor_Live.jpg

President Barack Obama stands with Ray Kapaun, nephew of Chaplain (Captain) Emil J. Kapaun, U.S. Army, as he awards the Medal of Honor posthumously to Chaplain Kapaun in the East Room of the White House in Washington on April 11, 2013. (Associated Press)