As escalating tensions between North Korea and the US under Donald Trump prompt fears of a nuclear war, survivors of the only two nuclear attacks to have taken place have issued a warning about the threat posed by atomic weapons.

Survivors of the US attacks on Japanese cities of the Hiroshima and Nagasaki in August 1945 gave their recollection of the deadly bombings and their thoughts, 72 years after the events, on nuclear weapons and the consequences of using them.

Their memories were published in a photo essay for TIME magazine.

Seventy-eight-year-old Takato Michishita, who survived the bombing after his mother had a “bad feeling” and made him stay home from school that say, said: “Dear young people who have never experienced war, Wars begin covertly. If you sense it coming, it may be too late.’

“Japan is the only nation that has experienced a nuclear attack. We must assert, with far more urgency, that nuclear weapons cannot coexist with mankind.

“Average citizens are the primary victims of war, always. Dear young people who have never experienced the horrors of war – I fear that some of you may be taking this hard-earned peace for granted.”

Yoshiro Yamawaki, 83, had to cremate his father after finding him dead. He said: “One can understand the horrors of nuclear warfare by visiting the atomic bomb museums in Hiroshima and Nagasaki, listening to first-hand accounts of hibakusha survivors, and reading archival documents from that period.

“Nuclear weapons should, under no circumstances, be used against humans. However, nuclear powers such as the US and Russia own stockpiles of well over 15,000 nuclear weapons. Not only that, technological advances have given way to a new kind of bomb that can deliver a blast over 1,000 times that of the Hiroshima bombing.

In pictures: 70th anniversary of atomic bombing of Hiroshima Show all 15 1 /15 In pictures: 70th anniversary of atomic bombing of Hiroshima In pictures: 70th anniversary of atomic bombing of Hiroshima Japan Japanese Prime Minister Shinzo Abe (C) leaves the cenotaph after delivering his speech during the memorial ceremony marking the 70th anniversary of the atomic bombing at Hiroshima Peace Memorial Peace Park in Hiroshima In pictures: 70th anniversary of atomic bombing of Hiroshima Japan People crowd as they pray for victims in front of the cenotaph for the victims of the 1945 atomic bombing, at Peace Memorial Park in Hiroshima In pictures: 70th anniversary of atomic bombing of Hiroshima Japan Doves are released as a sign of peace during the Hiroshima Peace Memorial Ceremony at the Hiroshima Peace Memorial Park on the day of the 70th anniversary of the atomic bombing of Hiroshima In pictures: 70th anniversary of atomic bombing of Hiroshima Japan Boys and girls offer flower bouquets on an altar during the 70th memorial service for the A-bomb victims at the Peace Memorial Park in Hiroshima In pictures: 70th anniversary of atomic bombing of Hiroshima Japan People offer prayers before a memorial monument during the 70th memorial service for the A-bomb victims at the Peace Memorial Park in Hiroshima In pictures: 70th anniversary of atomic bombing of Hiroshima Japan A girl (R) offers a prayer for victims of the atomic bombing during World War II in 1945, in front of a cenotaph at Hiroshima Peace Memorial Park In pictures: 70th anniversary of atomic bombing of Hiroshima Japan Representatives of bereaved families of victims killed by the atomic bombing strike the Peace Bell for a moment of silence for the victims during the peace memorial ceremony marking the 70th anniversary of the nuclear bombing of the city at Hiroshima Peace Memorial Park in Hiroshima In pictures: 70th anniversary of atomic bombing of Hiroshima Japan Attendees place flowers for victims killed by the atomic bombing during the peace memorial ceremony marking the 70th anniversary of the nuclear bombing of the city at Hiroshima Peace Memorial Park in Hiroshima In pictures: 70th anniversary of atomic bombing of Hiroshima Japan Representatives of A-bomb survivors carry a wreath to lay for victims killed by the atomic bombing at a cenotaph during the peace memorial ceremony marking the 70th anniversary of the nuclear bombing of the city at Hiroshima Peace Memorial Park in Hiroshima In pictures: 70th anniversary of atomic bombing of Hiroshima Japan Doves fly over the Hiroshima Peace Memorial Park during a memorial ceremony to mark the 70th anniversary of the atomic bombing of Hiroshima In pictures: 70th anniversary of atomic bombing of Hiroshima Japan Visitors pray for the atomic bomb victims in front of the cenotaph at the Hiroshima Peace Memorial Park in Hiroshima In pictures: 70th anniversary of atomic bombing of Hiroshima Japan People are seen visiting the Atomic Bomb Dome at the Hiroshima Peace Memorial Park In pictures: 70th anniversary of atomic bombing of Hiroshima Japan Local residents hold paper lanterns in front of the Atomic Bomb Dome during a procession commemorating the victims of the atomic bombing in Hiroshima, western Japan. Japan will mark the 70th anniversary of the attack on Hiroshima, where the U.S. dropped an atomic bomb on August 6, 1945, killing about 140,000 by the end of the year in a city of 350,000 residents In pictures: 70th anniversary of atomic bombing of Hiroshima USA Dr. Jimmy Hara (R) from the Physicians for Social Responsibility and Buddhist Monk Ryuzen Hayashi (L) pray during the 'Never Again - Hiroshima and Nagasaki 70th Anniversary Commemoration' vigil and moment of silence at the Chain Reaction Peace Sculpture showing a atomic bomb mushroom cloud in Santa Monica, California In pictures: 70th anniversary of atomic bombing of Hiroshima USA 86-year old Hiroshima survivor, Juni Sarashina (R) prays during the 'Never Again - Hiroshima and Nagasaki 70th Anniversary Commemoration' vigil and moment of silence at the Chain Reaction Peace Sculpture in Santa Monica, California

“Weapons of this capacity must be abolished from the Earth. However, in our current political climate we struggle to come to a consensus, and have yet to implement a ban on nuclear weapons. This is largely because nuclear powers are boycotting the agreement.

“I have resigned to the fact that nuclear weapons will not be abolished during the lifetime of us first generation hibakusha survivors. I pray that younger generations will come together to work toward a world free of nuclear weapons.”

Some, however, still cannot find words for what they endured: 92-year-old Kumiko Arakawa lost both of her parents and four of her siblings in the attack. Asked what message she would give to future generations she simply replied: “I can’t think of anything.”

Describing their recollection of the sunny morning of 9 August when the deadly bomb fell from the sky over Nagasaki, survivors mentioned many of the same memories: a flash of blinding white light, a wave of heat and pressure and then scenes of total devastation. Those who survived the Hiroshima bomb recalled similar details.

Many remembered seeing the charred and desperately damaged bodies of the dead and dying. Some of the survivors have suffered lifelong health problems from the radiation they were exposed to.

Fujio Torikoshi, 86, was badly injured by the bomb and was unconscious for several days afterwards.

He said: “I was told that I had until about age 20 to live. Yet here I am seven decades later, aged 86. All I want to do is forget, but the prominent keloid scar on my neck is a daily reminder of the atomic bomb.