Hiroshima Remembered

A woman offers prayers as she releases a paper lantern in the Motoyasu River with the backdrop of the Atomic Bomb Dome in Hiroshima, western Japan, Thursday, Aug. 6, 2009. Hiroshima's mayor urged global leaders on Thursday to back President Barack Obama's call to abolish nuclear weapons as Japan marked the 64th anniversary of the world's first atomic bomb attack.

Hiroshima Remembered — AP Photo/Shizuo Kambayashi

A girl holds a paper lantern before releasing it in the Motoyasu River with the backdrop of the Atomic Bomb Dome in Hiroshima, western Japan, Thursday, Aug. 6, 2009.

A girl releases a paper lantern in the Motoyasu River with the backdrop of the Atomic Bomb Dome in Hiroshima, western Japan, Thursday, Aug. 6, 2009. Hiroshima's mayor urged global leaders on Thursday to back President Barack Obama's call to abolish nuclear weapons as Japan marked the 64th anniversary of the world's first atomic bomb attack.

A family releases a paper lantern in the Motoyasu River with the backdrop of the Atomic Bomb Dome in Hiroshima, western Japan, Thursday, Aug. 6, 2009. Hiroshima's mayor urged global leaders on Thursday to back President Barack Obama's call to abolish nuclear weapons as Japan marked the 64th anniversary of the world's first atomic bomb attack.

A girl releases a paper lantern in the Motoyasu River with the backdrop of the Atomic Bomb Dome in Hiroshima, western Japan, Thursday, Aug. 6, 2009. Japan marked the 64th anniversary of the world's first atomic bomb attack on Thursday.

Residents of Hiroshima pray for the atomic bomb victims during the 64th anniversary of the world's first atomic bombing in the Hiroshima Peace Memorial Park in Hiroshima Thursday, Aug. 6, 2009. Hiroshima marks the 64th anniversary of the the atomic bomb attack that devastated the western Japanese city at the closing days of World War II.

In this photo provided by the city of Hiroshima, Japanese Prime Minister Taro Aso bows in front of the cenotaph dedicated to the victims of the 1945 atomic bombing at the Hiroshima Peace Memorial Park in Hiroshima, Japan, Thursday, Aug. 6, 2009. The event marked the 64th anniversary of the atomic bomb attack that devastated the city.

With the gutted Atomic Bomb Dome as a backdrop, doves fly over the cenotaph of the Peace Memorial Park at Hiroshima, western Japan, Thursday, Aug. 6, 2009. Hiroshima marks the 64th anniversary of the the world's first atomic bomb attack that devastated the western Japanese city at the closing days of World War II.

Women pray for the atomic bomb victims in front of the cenotaph at the Peace Memorial Park in Hiroshima, western Japan, early Thursday morning, Aug. 6, 2009. Hiroshima marks the 64th anniversary of the atomic bomb attack that devastated the city at the closing days of World War II.

A family prays for the atomic bomb victims in front of the cenotaph at the Peace Memorial Park in Hiroshima, western Japan, early Thursday morning, Aug. 6, 2009. Hiroshima marks the 64th anniversary of the atomic bomb attack that devastated the city at the closing days of World War II.

A woman prays for the atomic bomb victims in front of the cenotaph at the Peace Memorial Park in Hiroshima, western Japan, early Thursday morning, Aug. 6, 2009. Hiroshima marks the 64th anniversary of the atomic bomb attack that devastated the city at the closing days of World War II.

A mother and child pray for the atomic bomb victims in front of the cenotaph at the Peace Memorial Park in Hiroshima, western Japan, early Thursday morning, Aug. 6, 2009. Hiroshima marks the 64th anniversary of the atomic bomb attack that devastated the city at the closing days of World War II.

A father prays for the atomic bomb victims in front of the cenotaph at the Peace Memorial Park in Hiroshima, western Japan, early Thursday morning, Aug. 6, 2009. Hiroshima marks the 64th anniversary of the atomic bomb attack that devastated the city at the closing days of World War II.

A woman burns an incense stick to pray for the victims of an atomic bombing in front of the cenotaph at the Peace Memorial Park in Hiroshima, western Japan, early Thursday morning, Aug. 6, 2009. Hiroshima marks the 64th anniversary of the atomic bomb attack that devastated the city at the closing days of World War II.

CBS News 24/7