A Hillsborough County Sheriff's motorcycle following an accident while escorting US President Barack Obama to a speech about trade policies with Latin America at the Port of Tampa in Tampa, Florida, April 13, 2012.
US President Barack Obama and First Lady Michelle Obama take part in a ceremony May 28, 2012 at the Vietnam War Memorial in Washington, DC. The Memorial Day event also marks the 50th anniversary of the start of the Vietnam War.
U.S. President Barack Obama is pictured on the South Lawn of the White House in Washington, April 19, 2012, after welcoming the BCS National Champion University of Alabama Crimson Tide in honor of their 14th championship.
A handout picture released by the Higher Committee for the Syrian Revolution on April 11, 2012 shows a boy holding a burnt out bicycle in a house destroyed by violence in the town of Dael in the southern Syrian province of Daraa.
Pakistani relatives of the the plane crash victims mourn at the airport in Karachi on April 20, 2012. Up to 130 people are feared dead after a Boeing 737 crashed while trying to land in bad weather near the Pakistani capital Islamabad on April 20, officials said.
A handout picture released by the Higher Committee for the Syrian Revolution on April 11, 2012 shows a burnt out cot in a house destroyed by conflict in the town of Dael in the southern Syrian province of Daraa.