
President Barack Obama hugs Shigeaki Mori, an atomic bomb survivor who created the memorial for American WWII POWs killed at Hiroshima, during a ceremony at Hiroshima Peace Memorial Park in Hiroshima, Japan, Friday, May 27. Obama on Friday became the first sitting U.S. president to visit the site of the world's first atomic bomb attack.

President Obama, center, accompanied by Japanese Prime Minister Shinzo Abe, left, shakes hands and talks with Sunao Tsuboi, a survivor of the 1945 atomic bombing and chairman of the Hiroshima Prefectural Confederation of A-bomb Sufferers Organization (HPCASO), at Hiroshima Peace Memorial Park in Hiroshima, western Japan.

President Obama, right, and Japanese Prime Minister Shinzo Abe shake hands after laying wreaths at the Hiroshima Peace Memorial Park in Hiroshima on May 27. Obama is the first sitting U.S. president to visit Hiroshima.

President Obama lays a wreath at Hiroshima Peace Memorial Park Friday.

President Obama, right, is greeted Japanese Prime Minister Shinzo Abe upon arriving at the Hiroshima Peace Memorial Park.

President Obama walks off Marine One at the landing zone in Hiroshima, western Japan.

President Barack Obama and U.S. Ambassador to Japan Caroline Kennedy arrive at the Marine Corps' Air Station Iwakuni in the western Japanese city.

U.S. President Barack Obama, foreground center, is greeted by U.S. Marines and their families at Iwakuni air station.

President Obama speaks to members of the U.S. and Japanese military at the Marine Corps Air Station Iwakuni in Japan before continuing to Hiroshima.

President Obama speaks to U.S. and Japanese troops during his visit to the Marine Corps Air Station.

President Obama greets military personnel at the Marine Corps Air Station Iwakuni.

Police officers, seen through the cenotaph, patrol at Hiroshima Peace Memorial Park in Hiroshima.

A helicopter takes off near the the Atomic Bomb Dome in Hiroshima, Japan.