The Geneva-based ICAN won the USD 1.1 million prize because it "has been a driving force in prevailing upon the world's nations to pledge to cooperate ... in efforts to stigmatise, prohibit and eliminate nuclear weapons," Norwegian Nobel Committee chairwoman Berit Reiss-Andersen said in the announcement.
The prize "sends a message to all nuclear-armed states and all states that continue to rely on nuclear weapons for security that it is unacceptable behaviour. We will not support it, we will not make excuses for it, we can't threaten to indiscriminately slaughter hundreds of thousands of civilians in the name of security. That's not how you build security," ICAN executive director Beatrice Fihn told reporters in Geneva.
"We are trying to send very strong signals to all states with nuclear arms, nuclear-armed states, North Korea, US, Russia, China, France, UK, Israel, all of them, India, Pakistan, it is unacceptable to threaten to kill civilians," she said.
The prize comes amid heightened tensions over both North Korea's aggressive development of nuclear weapons and President Donald Trump's persistent criticism of the deal to curb Iran's nuclear programme.
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Reiss-Andersen noted that similar prohibitions have been reached on chemical and biological weapons, land mines and cluster munitions.
"Nuclear weapons are even more destructive, but have not yet been made the object of a similar international legal prohibition," she said.
Asked by journalists whether the prize was essentially symbolic, given that no international measures against nuclear weapons have been reached, Reiss-Andersen said "What will not have an impact is being passive.