An online exhibition promoting a nuclear-free world has opened, set up by a group of survivors of the atomic bombings of Hiroshima and Nagasaki.

The Japan Confederation of A-and H-bomb Sufferers Organizations, or Hidankyo, says the threat of nuclear weapons is increasing as Russia's invasion of Ukraine continues.

The group's Assistant Secretary General Hamasumi Jiro said the world must be informed of the consequences of nuclear weapons now more than ever, amid the heightened risk of nuclear weapons being used.

The exhibition, made up of about 50 panels of photos and texts, was set up by the confederation and other non-profit organizations.

It features items displayed in the past by the group at the UN Headquarters and elsewhere. Online visitors can see images of the devastation in Hiroshima and Nagasaki immediately after the bombings.

The site is available in Japanese and English to highlight the efforts of the survivors and others whose aim is to realize a world without nuclear weapons.

Officials say that the English site has been accessed mainly by overseas viewers in the US.

Crowdfunding is helping to manage the site with hopes of soon making it available in the languages of nuclear states Russia and China.