Matsui criticized nuclear deterrence and nuclear umbrellas as flaunting "the destructive power of nuclear weapons and seeking to maintain global order by generating fear in rival countries" and urged world leaders to use reason and insight to abolish nuclear weapons.
About 50,000 people, including Hiroshima residents and representatives from 80 countries, including U.S. Ambassador William Hagerty, attended this year's ceremony.
Prime Minister Shinzo Abe, who also was at the ceremony, said differences between the nuclear and non-nuclear states are widening.
The August 6, 1945 bombing of Hiroshima, which killed 170,000 people in the world's first use of atomic weapon, was followed three days later by the bombing of the city of Nagasaki, which killed more than 70,000 people, and led to Japan's unconditional surrender, ending World War II.
More than 300,000 people across China were killed by Japan's biological weapons during WWII.
Matsui also expressed hope for the easing of tensions on the Korean Peninsula to proceed through "peaceable dialogue", as the USA and North Korea reached an agreement to denuclearize the peninsula in their summit in June. -North Korean summit in June.
Matsui expressed hope that the easing of tensions on the Korean Peninsula will continue through dialogue and called on global leaders to make an worldwide treaty comprehensively prohibiting nuclear weapons a "milestone" toward the goal of ridding the world of nuclear arsenals.
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For example, the Imperial Japanese Army's notorious Unit 731, which was based in the Pingfang district of Harbin, the largest city then in northeast China, was set up around 1936 and conducted vivisection experiments on live human beings to test germ-releasing bombs and chemical bombs, among other criminal atrocities.
The nuclear bomb weighed 4,400kg, measured about 3 metres long and was dropped at 8.15 am on August 6, 1945. The pact was adopted in July 2017.
"Certain countries are blatantly proclaiming self-centred nationalism and modernising their nuclear arsenals, rekindling tensions that had eased with the end of the Cold War", Matsui said, without identifying the nations.
Yuhi Nakagawa, 18, said, "When I was creating the buildings before the atomic bomb fell and after, I saw many photos of buildings that were gone".
"The important thing now is to patiently continue efforts to gain cooperation from both nuclear and nonnuclear states and take practical steps", Abe said, highlighting the importance of pursuing nuclear disarmament through the Nuclear Nonproliferation Treaty, or NPT.
UN Secretary General Antonio Guterres said in his message during the ceremony that Hiroshima's legacy is one of "resilience" and sought continued moral support from the hibakusha survivors for efforts in promoting the ban of nuclear weapons. Those holding hibakusha certificates numbered 154,859 as of March this year, the lowest on record, while their average age stood at 82.06. I really felt how scary atomic bombs can be.