U.S. President Barack Obama's announcement that he will visit Hiroshima on May 27 following the Group of Seven Ise-Shima summit was welcomed by a variety of people in Japan and the United States on Wednesday.

Attention has turned to what he will say and do at the site of the world's first atomic bombing, and whether the visit by the first ever sitting U.S. president will be viewed as a de facto apology.

A diplomatic source said Obama may lay flowers, visit the Peace Memorial Museum and make a short speech or statement in which he calls for nuclear disarmament.