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A woman prays in front of a monument for atomic bomb victims at the Hiroshima Peace Memorial Park on the day of the 68th anniversary of the atomic bombing of Hiroshima on August 6, 2013 in Hiroshima, Japan. Japan marks the 68th anniversary of the first atomic bomb that was dropped on Hiroshima by the United States on August 6, 1945, killing an estimated 70,000 people instantly with many thousands more dying over the following years from the effects of radiation. Three days later another atomic bomb was dropped on Nagasaki, ending World War II. (Photo by Buddhika Weerasinghe/Getty Images) ( 175666963 )

A mother and her son look at their paper lantern lit in remembrance for victims of the 1945 atomic bombing of Hiroshima before floating it on the Motoyasu River in front of the Atomic Bomb Dome at the Peace Memorial Park in Hiroshima, western Japan, on August 6, 2013. Tens of thousands gathered at the park in Hiroshima on August 6 to mark the 68th anniversary of the US atomic bombing of the city, as anti-nuclear sentiment runs high in the country. AFP PHOTO / TORU YAMANAKA/AFP/Getty Images ( 521906526 )

Japan's Prime Minister Shinzo Abe delivers his speech at the Hiroshima Peace Memorial Park during the ceremony to mark the 68th anniversary of the atomic bombing of Hiroshima, western Japan, Tuesday, Aug. 6, 2013. (AP Photo/Kyodo News) ( Japan Hiroshima Anniversary )

People pray for the atomic bomb victims at the Hiroshima Peace Memorial Park in Hiroshima, western Japan, early Tuesday, Aug. 6, 2013. Japan marked the 68th anniversary Tuesday of the atomic bombing of Hiroshima with pledges to seek to eliminate nuclear weapons. (AP Photo/Shizuo Kambayashi) ( Japan Hiroshima Anniversary )

Indian students with their faces painted in colors, participate in a Hiroshima Day peace rally in Mumbai, India, Tuesday, Aug. 6, 2013. (AP Photo/Rafiq Maqbool) ( APTOPIX India Hiroshima Day )

Pacifist militants stage a commemorative demonstration at the Peace Wall in Paris, Tuesday Aug. 6, 2013, to mark the 68th anniversary of the atomic bombing of Hiroshima. The signs read "Abolition of Nuclear Weapons." (AP Photo/Remy de la Mauviniere) ( France Hiroshima Anniversary )

Masaki Namikawa, 11, left, and Keita Deguchi, 9, hang a bundle of paper cranes to add on to thousands of them already placed as a symbolic act dedicated from across the world for world peace at Hiroshima Memorial Peace Park in Hiroshima, western Japan, Monday, Aug. 5, 2013. (AP Photo/Shizuo Kambayashi) ( Japan Hiroshima Anniversary )

A mother and her children pray for atomic bomb victims victims at the Hiroshima Peace Memorial Park on the day of the 68th anniversary of the atomic bombing of Hiroshima on August 6, 2013 in Hiroshima, Japan. (Photo by Buddhika Weerasinghe/Getty Images) ( 175666954 )

Paper cranes are displayed near the Children's Peace Monument at the Hiroshima Peace Memorial Park on the day of the 68th anniversary of the atomic bombing of Hiroshima on August 6, 2013 in Hiroshima, Japan. (Photo by Buddhika Weerasinghe/Getty Images) ( 175666957 )

A woman burns incenses and pray in front of a monument for atomic bomb victims at the Hiroshima Peace Memorial Park on the day of the 68th anniversary of the atomic bombing of Hiroshima on August 6, 2013 in Hiroshima, Japan. (Photo by Buddhika Weerasinghe/Getty Images) ( 175666964 )

Paper lanterns lit in remembrance for victims of the 1945 atomic bombing of Hiroshima float on the Motoyasu River in front of the Atomic Bomb Dome at the Peace Memorial Park in Hiroshima, western Japan, on August 6, 2013. AFP PHOTO / TORU YAMANAKA/AFP/Getty Images ( 521906519 )

Japanese people pray in front of a monument for atomic bomb victims at the Hiroshima Peace Memorial Park on the day of the 68th anniversary of the atomic bombing of Hiroshima on August 6, 2013 in Hiroshima, Japan. (Photo by Buddhika Weerasinghe/Getty Images) ( 175666969 )

An Indian youth, his face painted with a peace message, takes part in a rally to mark Hiroshima Day in Mumbai on August 6, 2013, to mourn victims of the atomic bombing of Hiroshima in 1945. Peace rallies and memorial services the world over marked the world's first nuclear attack on Hiroshima - the moment 68 years ago when a single US bomb instantly killed more than 140,000 people and fatally injured tens of thousands of others with radiation or horrific burns. AFP PHOTO/Indranil MUKHERJEE/AFP/Getty Images ( 521906671 )

People pray in front of a monument for atomic bomb victims at the Hiroshima Peace Memorial Park on the day of the 68th anniversary of the atomic bombing of Hiroshima on August 6, 2013 in Hiroshima, Japan. (Photo by Buddhika Weerasinghe/Getty Images) ( 175667005 )

Japanese people wait to pray in front of a monument for atomic bomb victims at the Hiroshima Peace Memorial Park on the day of the 68th anniversary of the atomic bombing of Hiroshima on August 6, 2013 in Hiroshima, Japan. (Photo by Buddhika Weerasinghe/Getty Images) ( 175666975 )

A woman burns incenses and pray in front of a monument for atomic bomb victims at the Hiroshima Peace Memorial Park on the day of the 68th anniversary of the atomic bombing of Hiroshima on August 6, 2013 in Hiroshima, Japan. (Photo by Buddhika Weerasinghe/Getty Images) ( 175666976 )

Japanese people wait to pray in front of a monument for atomic bomb victims at the Hiroshima Peace Memorial Park on the day of the 68th anniversary of the atomic bombing of Hiroshima on August 6, 2013 in Hiroshima, Japan. (Photo by Buddhika Weerasinghe/Getty Images) ( 175666977 )

Japanese people pray front the Children's Peace Monument tat the Hiroshima Peace Memorial Park on the day of the 68th anniversary of the atomic bombing of Hiroshima on August 6, 2013 in Hiroshima, Japan. (Photo by Buddhika Weerasinghe/Getty Images) ( 175666983 )

Japanese people pray for atomic bomb victims in front of a Atomic Bomb Dome at the Hiroshima Peace Memorial Park on the day of the 68th anniversary of the atomic bombing of Hiroshima on August 6, 2013 in Hiroshima, Japan. (Photo by Buddhika Weerasinghe/Getty Images) ( 175666988 )

A woman burns incenses and pray in front of a monument for atomic bomb victims at the Hiroshima Peace Memorial Park on the day of the 68th anniversary of the atomic bombing of Hiroshima on August 6, 2013 in Hiroshima, Japan. (Photo by Buddhika Weerasinghe/Getty Images) ( 175667001 )

People pray in front of a monument for atomic bomb victims at the Hiroshima Peace Memorial Park on the day of the 68th anniversary of the atomic bombing of Hiroshima on August 6, 2013 in Hiroshima, Japan. (Photo by Buddhika Weerasinghe/Getty Images) ( 175667007 )

Hiroko Miyahara, who survived the nuclear bombing of the city of Hiroshima in 1945, plants a tree Ginko biloba (descendent of a 200 year old tree that survived the atomic bombing of Hiroshima in 1945) in front her daughter Akiko Perona, left, and from 2nd left, Achim Halpaap, Associate Director of UNITAR, Francois Bugnion, member of ICRC Assembly, Japanese Ambassador Takashi Okada and his wife, Olivier Vodoz, Vice President of ICRC, and Geneva State Councillor Isabel Rochat, during a ceremony to recall the dangers of nuclear weapons use at the ICRC headquarters, in Geneva, Switzerland, Tuesday, Aug. 6, 2013. (AP Photo/Keystone, Salvatore Di Nolfi) ( Switzerland Hiroshima Anniversary )

The Atomic Bomb Dome is silhouetted at sunset in Hiroshima, western Japan, Monday, Aug. 5, 2013. Hiroshima marks the 68th anniversary of the world's first atomic bombing Tuesday.(AP Photo/Shizuo Kambayashi) ( Japan Hiroshima Anniversary )

Residents of Hiroshima hold paper lanterns before releasing them into the Motoyasu River, wishing for the world peace in front of the Atomic Bomb Dome in Hiroshima, western Japan, Tuesday, Aug. 6, 2013. (AP Photo/Shizuo Kambayashi) ( Japan Hiroshima Anniversary )

Japanese Prime Minister Shinzo Abe, third from left, accompanied by Hiroshima Peace Memorial Museum Director Kenji Shiga, left, looks at a diorama of Hiroshima city after the Aug. 6, 1945 atomic bombing, at Hiroshima Peace Memorial Museum in Hiroshima, western Japan, Tuesday, Aug. 6, 2013. (AP Photo/Shizuo Kambayashi) ( Japan Hiroshima Anniversary )

An Indian student with painted face participates in a Hiroshima Day peace rally in Mumbai, India, Tuesday, Aug. 6, 2013. (AP Photo/Rafiq Maqbool) ( India Hiroshima Day )

A boy releases a paper lantern to the Motoyasu River with the backdrop of the Atomic Bomb Dome in Hiroshima, western Japan, Tuesday, Aug. 6, 2013. (AP Photo/Shizuo Kambayashi) ( Japan Hiroshima Anniversary )

Buddhist monks chant a Buddhist mantra while beating drums in front of the Atomic Bomb Dome in Hiroshima, western Japan, Monday, Aug. 5, 2013. (AP Photo/Shizuo Kambayashi) ( Japan Hiroshima Anniversary )

People wait in line to offer prayers in front of the cenotaph, center, dedicated to the victims of the atomic bombing at the Hiroshima Peace Memorial Park after the ceremony to mark the 68th anniversary of the bombing, in Hiroshima, western Japan, Tuesday, Aug. 6, 2013. (AP Photo/Shizuo Kambayashi) ( Japan Hiroshima Anniversary )

U.S. film director Oliver Stone, center front, attends the ceremony to mark the 68th anniversary of the atomic bombing of Hiroshima at the Hiroshima Peace Memorial Park, western Japan, Tuesday, Aug. 6, 2013. (AP Photo/Kyodo News) ( Japan Hiroshima Anniversary )

Pacifist militants stage a commemorative demonstration at the Peace Wall in Paris, Tuesday Aug. 6, 2013, to mark the 68th anniversary of the atomic bombing of Hiroshima. The sign in the foreground reads "Abolition of Nuclear Weapons." (AP Photo/Remy de la Mauviniere) ( France Hiroshima Anniversary )

Indian youths, their faces painted with peace messages, pose as they take part in a rally to mark Hiroshima Day in Mumbai on August 6, 2013, to mourn victims of the atomic bombing of Hiroshima in 1945. AFP PHOTO/Indranil MUKHERJEE/AFP/Getty Images ( 521906678 )

A child adjusts a placard held by her mother as they take part in a rally to mark Hiroshima Day in Mumbai on August 6, 2013, to mourn victims of the atomic bombing of Hiroshima in 1945. AFP PHOTO/Indranil MUKHERJEE/AFP/Getty Images ( 521906697 )

An Indian youth, her hands and face painted with peace messages, gestures while taking part in a rally to mark Hiroshima Day in Mumbai on August 6, 2013, to mourn victims of the atomic bombing of Hiroshima in 1945. AFP PHOTO/Indranil MUKHERJEE/AFP/Getty Images ( 521906752 )

Doves fly over the cenotaph dedicated to the victims of the atomic bombing at the Hiroshima Peace Memorial Park during the ceremony to mark the 68th anniversary of the bombing, in Hiroshima, western Japan, Tuesday, Aug. 6, 2013. (AP Photo/Shizuo Kambayashi) ( APTOPIX Japan Hiroshima Anniversary )

A man watches paper lanterns for the repose of the souls of the atomic bombing victims in the Motoyasu River near the Atomic Bomb Dome in Hiroshima, western Japan, Tuesday, Aug. 6, 2013. (AP Photo/Shizuo Kambayashi) ( APTOPIX Japan Hiroshima Anniversary )

Paper lanterns float along the Motoyasu River that runs by the Atomic Bomb Dome in Hiroshima, western Japan, Tuesday, Aug. 6, 2013. (AP Photo/Shizuo Kambayashi) ( Japan Hiroshima Anniversary )

An elderly woman prays for victims of the 1945 atomic bombing of Hiroshima in front of the cenotaph at the Peace Memorial Park in Hiroshima on August 5, 2013. Hiroshima is marking the 68th anniversary of the atomic bombing on August 6, 2013. AFP PHOTO/Toru YAMANAKA/AFP/Getty Images ( 521886138 )

Japanese Prime Minister Shinzo Abe lays a flower wreath on an altar for A-bomb victims at the Peace Memorial Park in Hiroshima, western Japan on August 6, 2013 as ceremonies are held to mark the 68th anniversary of the bombing. AFP PHOTO / JIJI PRESS /AFP/Getty Images ( 521897734 )

Elderly women pray for victims of the 1945 atomic bombing in front of the cenotaph at the Peace Memorial Park in Hiroshima on August 6, 2013 as ceremonies are held to mark the 68th anniversary of the bombing. Tens of thousands, including aging survivors, relatives, government officials and foreign delegates observed a moment of silence at 8:15 am local time, the time of the detonation which turned the city into a nuclear inferno in 1945. AFP PHOTO / TORU YAMANAKA/AFP/Getty Images ( 521898983 )

Buddhist monks pray for victims of the 1945 atomic bombing in front of the cenotaph at the Peace Memorial Park in Hiroshima on August 6, 2013 as ceremonies are held to mark the 68th anniversary of the bombing. AFP PHOTO / TORU YAMANAKA/AFP/Getty Images ( 521898985 )

US Ambassador to Japan John Roos (C) prays in silence at a memorial service for A-bomb victims at the Peace Memorial Park in Hiroshima, western Japan on August 6, 2013 as ceremonies are held to mark the 68th anniversary of the bombing. AFP PHOTO / JIJI PRESS /AFP/Getty Images ( 521899233 )

Family members of atomic bomb victims strike the Peace Bell at a memorial service for A-bomb victims at the Peace Memorial Park in Hiroshima, western Japan on August 6, 2013 as ceremonies are held to mark the 68th anniversary of the bombing. AFP PHOTO / JIJI PRESS/AFP/Getty Images ( 521899235 )

South Korean activists march while rolling a large balloon with a radioactivity warning sign during an anti-nuclear protest in Seoul on August 6, 2013 on the 68th anniversary of the atomic bombing of Hiroshima in Japan. AFP PHOTO / JUNG YEON-JEJUNG YEON-JE/AFP/Getty Images ( 521902414 )

South Korean activists hold a placard (L) reading "Remember Hiroshima," next to a large balloon (R) with a radioactivity warning sign during an anti-nuclear protest in Seoul on August 6, 2013 on the 68th anniversary of the atomic bombing of Hiroshima in Japan. The protesters called for the removal of all nuclear weapons and the shutdown of all nuclear power plants in the world. AFP PHOTO / JUNG YEON-JEJUNG YEON-JE/AFP/Getty Images ( 521902570 )

Paper lanterns lit in remembrance for victims of the 1945 atomic bombing of Hiroshima float on the Motoyasu River in front of the Atomic Bomb Dome at the Peace Memorial Park in Hiroshima, western Japan, on August 6, 2013. AFP PHOTO / TORU YAMANAKA/AFP/Getty Images ( 521906505 )