United Nations Secretary-General Ban Ki-moon hopes U.S. President Barack Obama's trip to Hiroshima will inspire new concrete actions leading to a nuclear-free world.

U.N. Spokesman Farhan Haq said Friday that Ban was "himself very strongly moved by his visit to Hiroshima and he believes that for world leaders to be able to see the consequences of the use of nuclear weapons can encourage all efforts to end their use anywhere in the world."

Haq pointed out that Ban was the first sitting U.N. secretary-general to visit Hiroshima.