NAGASAKI, Japan (AP) — The southern Japanese city of Nagasaki on Saturday marked 80 years since the U.S. atomic attack that killed tens of thousands and left survivors who hope their harrowing memories can help make their hometown the last place on Earth to be hit by a nuclear bomb.

The United States launched the Nagasaki attack on Aug. 9, 1945, killing 70,000 by the end of that year, three days after the bombing of Hiroshima that killed 140,000. Japan surrendered on Aug. 15, 1945, ending World War II and the nearly half-century of aggression by the country across Asia.

About 2,600 people, including representatives from more than 90 countries, attended a memorial event at Nagasaki Peace Park, where Mayor Shiro Suzuki and Prime Minister Shigeru Ishiba spoke, among other guests. At 11:02 a.m., the exact time when the plutonium bomb exploded above Nagasaki, participants observed a moment of silence as a bell rang.

“Even after the war ended, the atomic bomb brought invisible terror,” 93-year-old survivor Hiroshi Nishioka said in his speech at the memorial, noting that many who had survived without severe wounds started bleeding from gums and losing hair and died.

“Never use nuclear weapons again, or we’re finished,” he said.

Dozens of doves, a symbol of peace, were released after a speech by Suzuki, whose parents are survivors of the attack. He said that the city’s memories of the bombing are “a common heritage and should be passed down for generations” in and outside Japan.

“The existential crisis of humanity has become imminent to each and every one of us living on Earth,” Suzuki said. “In order to make Nagasaki the last atomic bombing site now and forever, we will go hand-in-hand with global citizens and devote our utmost efforts toward the abolition of nuclear weapons and the realization of everlasting world peace.”

Survivors and their families gathered Saturday in rainy weather at Peace Park and nearby Hypocenter Park, located below the bomb’s exact detonation spot, hours before the official ceremony.

“I simply seek a world without war,” said Koichi Kawano, an 85-year-old survivor who laid flowers at the hypocenter monument decorated with colorful origami paper cranes and other offerings.

Some others prayed at churches in Nagasaki, home to Catholic converts who went deep underground during centuries of violent persecution in Japan’s feudal era.

The twin bells at Urakami Cathedral, which was destroyed in the bombing, also rang together again after one of the bells that had gone missing following the attack was restored by volunteers.

Despite their pain from wounds, discrimination and illnesses from radiation, survivors have publicly committed to a shared goal of abolishing nuclear weapons. But they worry about the world moving in the opposite direction.

Aging survivors and their supporters in Nagasaki now put their hopes of achieving nuclear weapons abolition in the hands of younger people, telling them the attack isn’t distant history, but an issue that remains relevant to their future.

“There are only two things I long for: the abolition of nuclear weapons and prohibition of war,” said Fumi Takeshita, an 83-year-old survivor. “I seek a world where nuclear weapons are never used and everyone can live in peace.”

In the hope of passing down the lessons of history to current and future generations, Takeshita visits schools to share her experience with children.

“When you grow up and remember what you learned today, please think what each of you can do to prevent war,” Takeshita told students during a school visit earlier this week.

Teruko Yokoyama, an 83-year-old member of a Nagasaki organization supporting survivors, said that she thinks of the growing absence of those she had worked with, and that fuels her desire to document the lives of others who are still alive.

The number of survivors has fallen to 99,130, about a quarter of the original number, with their average age exceeding 86. Survivors worry about fading memories, as the youngest of the survivors were too young to clearly recall the attack.

“We must keep records of the atomic bombing damages of the survivors and thier lifetime story,” said Yokoyama, whose two sisters died after suffering illnesses linked to radiation.

Her organization has started to digitize the narratives of survivors for viewing on YouTube and other social media platforms with the help of a new generation.

“There are younger people who are beginning to take action,” Yokoyama told The Associated Press on Friday. “So I think we don’t have to get depressed yet.”

Nagasaki hosted a “peace forum” on Friday where survivors shared their stories with more than 300 young people from around the country. Seiichiro Mise, a 90-year-old survivor, said that he’s handing seeds of “flowers of peace” to the younger generation in hopes of seeing them bloom.

Survivors are frustrated by a growing nuclear threat and support among international leaders for developing or possessing nuclear weapons for deterrence. They criticize the Japanese government’s refusal to sign or even participate in the Treaty on the Prohibition of Nuclear Weapons as an observer because Japan, as an American ally, says it needs U.S. nuclear possession as deterrence.

In Ishiba’s speech, the prime minister reiterated Japan’s pursuit of a nuclear-free world, pledging to promote dialogue and cooperation between countries with nuclear weapons and nonnuclear states at the Non-Proliferation of Nuclear Weapons review conference scheduled for April and May 2026 in New York. Ishiba didn’t mention the nuclear weapons ban treaty.

“Countries must move from words to action by strengthening the global disarmament regime,” with the Treaty on the Non-Proliferation of Nuclear Weapons, or NPT, at the center, complemented by the momentum created by the nuclear weapons ban treaty, said U.N. Secretary-General António Guterres, in his message read by Under-Secretary-General Izumi Nakamitsu in Nagasaki.

Nagasaki invited representatives from all countries to attend the ceremony on Saturday. The government in China notably notified the city that it wouldn’t be present without providing a reason.

The ceremony last year stirred controversy because of the absence of the U.S. ambassador and other Western envoys in response to the Japanese city’s refusal to invite officials from Israel.

Mari Yamaguchi reported from Tokyo.