President Barack Obama is seen on a television monitor in the press briefing room as he makes a televised statement on the death of Osama bin Laden from the East Room of the White House in Washington. - Photo by AP

Obama gets applaud as he speaks about the killing of Osama at a dinner of Bi-partisan committee chairmen and ranking members and their spouses in the East Room of the White House. - Photo by AFP

Crowds celebrate on Pennsylvania Avenue in front of the White House, after Obama announced that Bin Laden had been killed. - Photo by AP

In this image released by the White House, Obama talks with members of the national security team at the conclusion of one in a series of meetings discussing the mission against Osama, in the Situation Room of the White House. - Photo by AP

Former New York Mayor Rudolph Giuliani (L) addresses the media outside the 9/11 Memorial Preview Site near the World Trade Center site in New York. - Photo by Reuters

A crowd gathered in New York's Times Square reacts to the news of Bin Laden's death. - Photo by AP

House Minority Leader Nancy Pelosi, D-Calif., center and Assistant Leader Jim Clyburn, D-SC, left, and Minority Whip Steny Hoyer, D-Md., arrive to comment on the death of Osama bin Laden at the Capitol in Washington. - Photo by AP

A man gives the “V” for victory sign as he stands in front of Newspaper front pages announcing the death of Osama in front of the Newseum in Washington, DC. - Photo by AFP

In this image released by the White House, Obama shakes hands with Adm. Mike Mullen, Chairman of the Joint Chiefs of Staff, in the Green Room of the White House, following his statement detailing the mission against Bin Laden. CIA Director Leon Panetta, left, and Secretary of State Hillary Rodham Clinton are pictured at left. - Photo by AP

In this image released by the White House, from left, James Clapper, Director of National Intelligence, National Security Adviser Tom Donilon, CIA Director Leon Panetta, Chairman of the Joint Chiefs Adm. Mike Mullen, Secretary of State Hillary Rodham Clinton, and Vice President Joe Biden listen as President Obama delivers a televised speech from the East Room at the White House, announcing the death of Osama. - Photo by AP

A shirtless reveler holds an American flag as he and others fill East Beaver Canyon Avenue in downtown State College, Pa., shortly after learning about the death of Bin Laden. - Photo by AP

Penn State senior Jake Librizzi holds an American flag as he and others fill Beaver Canyon Avenue in downtown State College. - Photo by AP