Paper lanterns float in the river at the Peace Memorial Park in Hiroshima, Japan, Aug. 6, 2019. Hiroshima, the Japanese city hit by a U.S. atomic bomb at the end of the World War II, marked the 74th anniversary of the bombing on Tuesday. (Xinhua/Du Xiaoyi)

People queue to commemorate the victims at the Peace Memorial Park for the atomic bomb victims in Hiroshima, Japan, Aug. 6, 2019. Hiroshima, the Japanese city hit by a U.S. atomic bomb at the end of the World War II, marked the 74th anniversary of the bombing on Tuesday. (Xinhua/Du Xiaoyi)

Paper lanterns float in the river at the Peace Memorial Park in Hiroshima, Japan, Aug. 6, 2019. Hiroshima, the Japanese city hit by a U.S. atomic bomb at the end of the World War II, marked the 74th anniversary of the bombing on Tuesday. (Xinhua/Du Xiaoyi)

Paper lanterns float in the river at the Peace Memorial Park in Hiroshima, Japan, Aug. 6, 2019. Hiroshima, the Japanese city hit by a U.S. atomic bomb at the end of the World War II, marked the 74th anniversary of the bombing on Tuesday. (Xinhua/Du Xiaoyi)

People release paper lanterns to the river at the Peace Memorial Park in Hiroshima, Japan, Aug. 6, 2019. Hiroshima, the Japanese city hit by a U.S. atomic bomb at the end of the World War II, marked the 74th anniversary of the bombing on Tuesday. (Xinhua/Du Xiaoyi)