Hiroshima 80 Years On: Call for Nuclear Disarmament

The Hiroshima Peace Memorial Park marks where the atomic bomb was dropped on the southern Japanese city.

The world changed forever 80 years ago this Wednesday when the United States dropped an atomic bomb on the Japanese city of Hiroshima during the Second World War.

While the city has been rebuilt, nuclear conflict remains a global threat, UN High Representative for Disarmament Affairs Izumi Nakamitsu said in remarks at the Hiroshima Peace Memorial.

The memorial was the only structure left standing near the hypocentre of the bomb, which marked the first use of an atomic weapon in war.

Survivors, family members, and representatives from international organizations and 120 countries were among the approximately 55,000 people who attended the ceremony, according to the Japanese Prime Minister’s Office.

“On this 80th anniversary, we remember those who perished. We stand with the families who carry their memory,” said Ms. Nakamitsu, delivering a message on behalf of UN Secretary-General António Guterres.

She paid tribute to the hibakusha – the term for those who survived Hiroshima and the atomic bombing of Nagasaki three days later – “whose voices have become a moral force for peace.”

“While their numbers grow smaller each year, their testimony — and their eternal message of peace — will never leave us,” she said.

In a single moment on 6 August 1945, Hiroshima was reduced to ruins, tens of thousands were killed, “and humanity crossed a threshold from which there could be no return.”

In the aftermath, many believed the city would never recover and that nothing would grow, she said, but the people proved otherwise.

“You, the people of Hiroshima, didn’t just rebuild a city,” she said. “You rebuilt hope. You nurtured a vision of a world without nuclear weapons. And you shared that vision with the world.”

Ms. Nakamitsu noted that 2025 will also mark 80 years since the UN was founded. In May, saplings grown from the seeds of a persimmon tree that survived the bombing were planted at UN Headquarters in New York.

“They are more than symbols of survival,” she said. “They are living testaments to the strength of the human spirit — and of our shared duty to protect future generations from the horrors of nuclear annihilation.”

She said the UN anniversary is a reminder of why it was created in the first place – to prevent war, uphold human dignity, and ensure the tragedies of the past are never repeated.

“Yet, today the risk of nuclear conflict is growing,” she warned. “Trust is eroding. Geopolitical divisions are widening. And the very weapons that brought such devastation to Hiroshima and Nagasaki are once again being treated as tools of coercion.”

At the ceremony, Hiroshima’s Mayor Kazumi Matsui warned against the growing acceptance of nuclear weapons, citing the conflicts in Ukraine and the Middle East.

Last October, the Japanese anti-nuclear group Nihon Hidankyo — which represents the survivors of the bombings — was awarded the 2024 Nobel Peace Prize. This came just weeks after countries meeting at the UN adopted the Pact for the Future, re-committing to a world free of nuclear weapons.

Ms. Nakamitsu stressed that “commitments must lead to real change by strengthening the global disarmament regime — in particular, the Treaty on the Non-Proliferation of Nuclear Weapons, complemented by the momentum created by the Treaty on the Prohibition of Nuclear Weapons.”

She urged countries to draw strength from both the resilience of Hiroshima and the wisdom of the hibakusha.

“Let’s work to eradicate the threat of nuclear weapons by eradicating the weapons themselves,” she said.

“And let’s keep our pledge to the hibakusha, ensuring that their testimony and message of peace is carried forward. Remembering the past is about protecting and building peace today — and in the future.”