People celebrate the death of Osama bin Laden in Times Square in New York City on Sunday night.

 U.S. Marines of Regiment Combat Team 1 watch TV at Camp Dwyer in Helmand Province, Afghanistan on Monday as President Obama announces the death of Osama bin Laden. Obama said late Sunday U.S. time that justice had been done after the September 11, 2001, attacks, but warned that al-Qaida will still try to attack the U.S.
 President Barack Obama is pictured after announcing the death of Osama bin Laden, from the East Room of the White House in Washington on Sunday. The al-Qaida was killed earlier that day in a firefight with U.S. forces in Pakistan and his body was recovered, Obama said.
 A crowd outside the White House in Washington cheers on Sunday upon hearing the news that terrorist leader Osama bin Laden is dead.
 Crowds gather at ground zero in New York early Monday, shortly after President Obama announced that a U.S. military operation had killed Osama bin Laden in a firefight at a large mansion in Pakistan.
 Crowds gather at ground zero in New York on Monday.
 David Huber and Nicole Lozare of Arlington, Va., pay their respect to victims of the 9/11 terrorist attacks at the Pentagon Memorial early Monday morning, after President Obama announced bin Laden's death. A special forces-led operation killed the al-Qaida leader in a mansion outside Islamabad in Pakistan.
 People cheer and wave flags on the "Freedom Bridge" just outside Joint Base Lewis-McChord, Sunday near Tacoma, Wash., after they heard the news of bin Laden's death.
 Arab-Americans celebrate the news of the death of Osama bin Laden in Dearborn, Mich., early Monday, May 2.
 A driver and passengers celebrate the death of Osama bin Laden in the streets of Lawrence, Kan., on Sunday. President Barack Obama announced Sunday night, May 1, that Osama bin Laden was killed in an operation led by the United States.
Actor Rob Lowe with a New York City fireman in Times Square in New York on Monday.
 Dionne Layne, right, hugs Mary Power in reacton to the news of the death of Osama bin Laden, Monday, May 2, in New York. At left is 1 World Trade Center, also known as the Freedom Tower, which is currently under construction. (Mark Lennihan / AP)
 Dan Parker of Shamokin, Pa., holds a U.S. flag outside the White House in Washington, D.C. on Monday after learning of Osama bin Laden's death.
 University of Texas at Austin students celebrate the news of Osama bin Laden’s death at Cain & Abel’s bar late Sunday night.
 People buy newspapers reporting the killing of al-Qaida leader Osama bin Laden at local newspaper printing press in Karachi, Pakistan on Monday.
 Afghan President Hamid Karzai, center, is flanked by vice presidents Mohammad Qasim Fahim, left, and Mohammed Karim Khalili, right, as he addresses the media at the presidential palace in Kabul on Monday. Afghan President Hamid Karzai said that the killing of Osama bin Laden in neighboring Pakistan proved Kabul's long-standing position that the war on terror was not rooted in Afghanistan.
 People shout slogans while holding placards and photographs of Osama bin Laden as they celebrate his killing in the western Indian city of Ahmedabad on Monday.
People light candles in the streets at Ground Zero, the site of the World Trade Center, in response to the death of Osama bin Laden on Sunday night, May 1, in New York City.