Atomic bomb survivors and anti-nuclear campaigners on Monday held a sit-in at Hiroshima's Peace Memorial Park to protest North Korea's sixth nuclear test the previous day.
About 90 protesters sat in front of the cenotaph for victims of the 1945 atomic bombing and raised a banner that read: "We strongly condemn the nuclear test."
An organizer called the detonation "an unforgivable action which tramples on Hiroshima's wishes for the total abolition of nuclear weapons."