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Japan this week marks the 75th anniversary of the atomic bomb attacks on Hiroshima and Nagasaki © Hiroshima Peace Memorial Museum/AFP/File / Handout

Special Report

‘Unspeakable horror’: the attacks on Hiroshima and Nagasaki

Tokyo, Japan, Aug 4 – Japan this week marks the 75th anniversary of the atomic bomb attacks on Hiroshima and Nagasaki, which killed over 200,000 people and left many more deeply traumatised and even stigmatised.

Here are some facts about the devastating attacks:

– The bombs –

The first atomic bomb was dropped on Hiroshima in western Japan on August 6, 1945 by the US bomber Enola Gay.

The US bomber Enola Gay dropped the atomic bomb over Hiroshima on August 6, 1945 at 8:15am local time © THE NATIONAL ARCHIVES/AFP/File / Handout

The bomb, weighing 13-16 kilotons, was nicknamed “Little Boy” but its impact was anything but small.

It detonated about 600 metres from the ground, with a force equivalent to 15,000 tonnes of TNT, and killed 140,000 people.

Tens of thousands died instantly, while others succumbed to injuries or illness in the weeks, months and years that followed.

Three days later, the US dropped a second bomb dubbed “Fat Man” on the city of Nagasaki, killing another 74,000 people.

The attacks remain the only time atomic bombs have been used in wartime.

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– The attacks –

Graphic on the atomic bombing of Hiroshima in Japan on August 6, 1945 © AFP

When the bomb was dropped on Hiroshima, the first thing people noticed was an “intense ball of fire” according to the International Committee of the Red Cross (ICRC).

Temperatures at the epicentre of the blast reached an estimated 7,000 degrees Celsius (12,600 Fahrenheit), which caused fatal burns within a radius of about three kilometres (five miles).

ICRC experts say there were cases of temporary or permanent blindness due to the intense flash of light, and subsequent related damage such as cataracts.

A whirlwind of heat generated by the explosion also ignited thousands of fires that burned several square kilometres (miles) of the largely wooden city. A firestorm that consumed all available oxygen caused more deaths by suffocation.

It has been estimated that burn- and fire-related casualties accounted for more than half of the immediate deaths in Hiroshima.

Graphic on the atomic bombing of Hiroshima in Japan on August 6, 1945, and Nagasaki on August 9. © AFP

The explosion generated an enormous shock wave that in some cases literally carried people away. Others were crushed to death inside collapsed buildings or injured or killed by flying debris.

“I remember the charred bodies of little children lying around the hypocentre area like black rocks,” Koichi Wada, who was 18 at the time of the Nagasaki attack, has said of the bombing.

– Radiation effects –

The bomb attacks unleashed radiation that proved deadly both immediately and over the longer term.

Radiation sickness was reported in the attack’s aftermath by many who survived the initial blast and firestorm.

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The attacks on Hiroshima and Nagasaki are the only times to date that nuclear weapons have been used in wartime © THE NATIONAL ARCHIVES/AFP/File / Handout

Acute radiation symptoms include vomiting, headaches, nausea, diarrhoea, haemorrhaging and hair loss, with radiation sickness fatal for many within a few weeks or months.

Bomb survivors, known as hibakusha, also experienced longer-term effects including elevated risks of thyroid cancer and leukaemia, and both Hiroshima and Nagasaki have seen elevated cancer rates.

Of 50,000 radiation victims from both cities studied by the Japanese-US Radiation Effects Research Foundation, about 100 died of leukaemia and 850 suffered from radiation-induced cancers.

The foundation found no evidence however of a “significant increase” in serious birth defects among survivors’ children.

– The aftermath –

The twin bombings dealt the final blow to imperial Japan, which surrendered on August 15, 1945, bringing an end to World War II.

Historians have debated whether the devastating bombings ultimately saved lives by bringing an end to the conflict and averting a ground invasion.

But those calculations meant little to survivors, many of whom battled decades of physical and psychological trauma, as well as the stigma that sometimes came with being a hibakusha.

In 2019, Pope Francis visited Hiroshima and Nagasaki, where he condemned the use of nuclear weapons and met with survivors of the attacks © AFP/File / Vincenzo PINTO

Despite their suffering and their status as the first victims of the atomic age, many survivors were shunned — in particular for marriage — because of prejudice over radiation exposure.

Survivors and their supporters have become some of the loudest and most powerful voices opposing the use of nuclear weapons, meeting world leaders in Japan and overseas to press their case.

Last year, Pope Francis met with several hibakusha on visits to Hiroshima and Nagasaki, paying tribute to the “unspeakable horror” suffered by victims of the attacks.

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In 2016, Barack Obama became the first sitting US president to visit Hiroshima. He offered no apology for the attack, but embraced survivors and called for a world free of nuclear weapons.

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