As soon as the House met for the day, Speaker Sumitra Mahajan said two bombs were dropped on the two Japanese cities 73 years ago which resulted in death of thousands of innocent people, including women and children, and million were injured and crippled for life.
In his speech at Hiroshima's Peace Memorial Park, Mayor Kazumi Matsui said certain nations were "rekindling tensions that had eased with the end of the Cold War", although he did not identify those nations.
Matsui called nuclear deterrents and umbrellas "inherently unstable and extremely dangerous" approaches that seek to maintain global order by only generating fear in rival countries.
Japanese Prime Minister Shinzo Abe at the anniversary event.
Japan suffered two nuclear attacks by the United States at the end of World War II, first in Hiroshima on August 6, 1945 and then in Nagasaki three days later.
Expressing hope that the easing of tensions on the Korean Peninsula will continue through dialogue, Matsui 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. Japan, which hosts U.S. troops and is covered by the USA nuclear umbrella protecting it from attack, has not signed the treaty.
A bell tolled in Hiroshima as Japan marked 73 years since the world's first atomic bombing, with the city's mayor warning that rising nationalism worldwide threatens peace.
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Organizers say this year is not just about discussing the threat nuclear weapons pose to the world; it's also about offering a pathway to a possible solution.
The Little Boy atomic bomb, the type detonated over Hiroshima on August 6, 1945.
Survivors, their relatives and other participants marked the 8:15 a.m. blast with a minute of silence.
"We in civil society fervently hope that the easing of tensions on the Korean Peninsula will proceed through peaceable dialogue, " he said.
And less than two months ago, U.S. President Donald Trump and North Korean leader Kim Jong Un agreed to the "complete denuclearization of the Korean Peninsula" during their summit in Singapore, though the deal has been criticized for lacking detail.
When you pull on the virtual reality goggles, you're treated to a walk along the Motoyasu River and take in the city in the moments before the bomb hits.
But he pledged to do more to bridge their gap. In order to gain cooperation from both sides, it is important for everyone to understand "the reality of the tragedy of nuclear attacks, " he said, and reiterated Japan's pledge to maintain it pacifist and non-nuclear principles.