The Japanese city of Nagasaki on Sunday marked its 75th anniversary of the U.S. atomic bombing, with the mayor and dwindling survivors urging world leaders including their own to do more for a nuclear weapons ban.

At 11:02 a.m., the moment the B-29 bomber Bockscar dropped a 4.5-ton (10,000-pound) plutonium bomb dubbed “Fat Man,” Nagasaki survivors and other participants stood in a minute of silence to honor more than 70,000 dead.

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Christians, wearing face masks, pray for the victims of U.S. atomic bombing during a mass at Urakami Cathedral in Nagasaki, southern Japan, Sunday, Aug. 9, 2020. Nagasaki marked the 75th anniversary of the atomic bombing on Sunday. (Kyodo News via AP)

The Japanese city of Nagasaki on Sunday marked its 75th anniversary of the U.S. atomic bombing, with the mayor and dwindling survivors urging world leaders including their own to do more for a nuclear weapons ban.

Christians, wearing face masks, pray for the victims of U.S. atomic bombing during a mass at Urakami Cathedral in Nagasaki, southern Japan, Sunday, Aug. 9, 2020. Nagasaki marked the 75th anniversary of the atomic bombing on Sunday. (Takuto KanekoKyodo News via AP)

Many survivors developed cancer or other illnesses due to their exposure to radiation and suffered discrimination.

A bereaved family member prays for the victims of U.S. atomic bombing at the Atomic Bomb Hypocenter Park in Nagasaki, southern Japan, Sunday, Aug. 9, 2020. Nagasaki marked the 75th anniversary of the atomic bombing on Sunday. (Kyodo News via AP)

A bereaved family member prays for the victims of U.S. atomic bombing at the Atomic Bomb Hypocenter Park in Nagasaki, southern Japan, Sunday, Aug. 9, 2020. Nagasaki marked the 75th anniversary of the atomic bombing on Sunday. (Kyodo News via AP)

A woman prays for the victims of U.S. atomic bombing in front of the Statue of Peace at the Peace Park in Nagasaki, southern Japan Sunday, Aug. 9, 2020. Nagasaki marked the 75th anniversary of the atomic bombing on Sunday. (Kyodo News via AP)

A woman prays for the victims of U.S. atomic bombing in front of the Statue of Peace at the Peace Park in Nagasaki, southern Japan Sunday, Aug. 9, 2020. Nagasaki marked the 75th anniversary of the atomic bombing on Sunday. (Kyodo News via AP)

High school students offer flowers for the victims of U.S. atomic bombing in front of a monument at the Atomic Bomb Hypocenter Park in Nagasaki, southern Japan, Sunday, Aug. 9, 2020. Nagasaki marked the 75th anniversary of the atomic bombing on Sunday. (Kyodo News via AP)

High school students offer flowers for the victims of U.S. atomic bombing in front of a monument at the Atomic Bomb Hypocenter Park in Nagasaki, southern Japan, Sunday, Aug. 9, 2020. Nagasaki marked the 75th anniversary of the atomic bombing on Sunday. (Kyodo News via AP)

The Aug. 9, 1945, bombing came three days after the United States dropped its first atomic bomb on Hiroshima, the world’s first ever nuclear attack that killed 140,000. On Aug. 15, Japan surrendered, ending World War II.

Christians, wearing face masks, pray for the victims of U.S. atomic bombing during a mass at Urakami Cathedral in Nagasaki, southern Japan, Sunday, Aug. 9, 2020. Nagasaki marked the 75th anniversary of the atomic bombing on Sunday. (Kyodo News via AP)

Christians, wearing face masks, pray for the victims of U.S. atomic bombing during a mass at Urakami Cathedral in Nagasaki, southern Japan, Sunday, Aug. 9, 2020. Nagasaki marked the 75th anniversary of the atomic bombing on Sunday. (Kyodo News via AP)

Many survivors developed cancer or other illnesses due to their exposure to radiation and suffered discrimination.

Christians, wearing face masks, pray for the victims of U.S. atomic bombing during a mass at Urakami Cathedral in Nagasaki, southern Japan, Sunday, Aug. 9, 2020. Nagasaki marked the 75th anniversary of the atomic bombing on Sunday. (Takuto KanekoKyodo News via AP)

Christians, wearing face masks, pray for the victims of U.S. atomic bombing during a mass at Urakami Cathedral in Nagasaki, southern Japan, Sunday, Aug. 9, 2020. Nagasaki marked the 75th anniversary of the atomic bombing on Sunday. (Takuto KanekoKyodo News via AP)

A bereaved family member prays for the victims of U.S. atomic bombing at the Atomic Bomb Hypocenter Park in Nagasaki, southern Japan, Sunday, Aug. 9, 2020. Nagasaki marked the 75th anniversary of the atomic bombing on Sunday. (Kyodo News via AP)

A bereaved family member prays for the victims of U.S. atomic bombing at the Atomic Bomb Hypocenter Park in Nagasaki, southern Japan, Sunday, Aug. 9, 2020. Nagasaki marked the 75th anniversary of the atomic bombing on Sunday. (Kyodo News via AP)

A woman prays for the victims of U.S. atomic bombing in front of the Statue of Peace at the Peace Park in Nagasaki, southern Japan Sunday, Aug. 9, 2020. Nagasaki marked the 75th anniversary of the atomic bombing on Sunday. (Kyodo News via AP)

A woman prays for the victims of U.S. atomic bombing in front of the Statue of Peace at the Peace Park in Nagasaki, southern Japan Sunday, Aug. 9, 2020. Nagasaki marked the 75th anniversary of the atomic bombing on Sunday. (Kyodo News via AP)

High school students offer flowers for the victims of U.S. atomic bombing in front of a monument at the Atomic Bomb Hypocenter Park in Nagasaki, southern Japan, Sunday, Aug. 9, 2020. Nagasaki marked the 75th anniversary of the atomic bombing on Sunday. (Kyodo News via AP)

High school students offer flowers for the victims of U.S. atomic bombing in front of a monument at the Atomic Bomb Hypocenter Park in Nagasaki, southern Japan, Sunday, Aug. 9, 2020. Nagasaki marked the 75th anniversary of the atomic bombing on Sunday. (Kyodo News via AP)