People mourn victims of the atomic bombings at the Peace Memorial Park in Hiroshima, Japan, on Aug. 6, 2018. Japan on Monday marked the 73rd anniversary of the atomic bombing of Hiroshima. (Xinhua/Ma Ping)

Japanese Prime Minister Shinzo Abe (Front) speaks during a ceremony commemorating the 73rd anniversary of the atomic bombing of Hiroshima at the Peace Memorial Park in Hiroshima, Japan on Aug. 6, 2018. (Xinhua/Ma Ping)

People attend a protest near the Atomic Bomb Dome in Hiroshima, Japan, on Aug. 6, 2018. Japan on Monday marked the 73rd anniversary of the atomic bombing of Hiroshima. (Xinhua/Ma Ping)

Pigeons fly over the Peace Memorial Park in Hiroshima, Japan, on Aug. 6, 2018. Japan on Monday marked the 73rd anniversary of the atomic bombing of Hiroshima. (Xinhua/Ma Caoran)