US

Japan marks 71st anniversary of Hiroshima atomic bombing

  • A woman lights a candle as she prays for the atomic bomb victims in front of the cenotaph at the Hiroshima Peace Memorial Park in Hiroshima, western Japan, early Saturday Aug. 6, 2016. Japan marked the 71st anniversary of the atomic bombing on Hiroshima.  (Tsuyoshi Ueda/Kyodo News via AP)

    A woman lights a candle as she prays for the atomic bomb victims in front of the cenotaph at the Hiroshima Peace Memorial Park in Hiroshima, western Japan, early Saturday Aug. 6, 2016. Japan marked the 71st anniversary of the atomic bombing on Hiroshima. (Tsuyoshi Ueda/Kyodo News via AP)  (The Associated Press)

  • A woman prays for the atomic bomb victims in front of the cenotaph at the Hiroshima Peace Memorial Park in Hiroshima, western Japan, early Saturday Aug. 6, 2016. Japan marked the 71st anniversary of the atomic bombing on Hiroshima.  (Tsuyoshi Ueda/Kyodo News via AP)

    A woman prays for the atomic bomb victims in front of the cenotaph at the Hiroshima Peace Memorial Park in Hiroshima, western Japan, early Saturday Aug. 6, 2016. Japan marked the 71st anniversary of the atomic bombing on Hiroshima. (Tsuyoshi Ueda/Kyodo News via AP)  (The Associated Press)

  • 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 71st anniversary of the bombing in Hiroshima, western Japan Saturday, Aug. 6, 2016. (Shingo Nishizume/Kyodo News via AP)

    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 71st anniversary of the bombing in Hiroshima, western Japan Saturday, Aug. 6, 2016. (Shingo Nishizume/Kyodo News via AP)  (The Associated Press)

Japan is marking the 71st anniversary of the atomic bombing of Hiroshima by renewing calls for a nuclear weapons free world.

Hiroshima Mayor Kazumi Matsui says world leaders should follow President Barack Obama and learn first-hand about the evils of nuclear weapons.

Obama in May paid tribute to 140,000 people killed by the world's first atomic bomb attack that was dropped by the U.S. to force Japan's capitulation in World War II. Obama became the first sitting U.S. president to visit Hiroshima.

Another atomic bombing three days after Hiroshima killed more than 70,000 people in Nagasaki.

About 50,000 people attended the ceremony Saturday at Hiroshima's Peace Park near the bomb's epicenter.