"During the ceremony, Hiroshima’s mayor welcomed the ambassador, John Roos, and praised President Obama..."

"... as one of the world leaders who 'wielded their powerful influence' to rid the world of nuclear weapons."

This is the first time a U.S. ambassador has attended the ceremony. The bomb was dropped on Hiroshima 65 years ago.

The White House and War Department announced today that an atomic bomb, possessing more power than 20,000 tons of TNT, a destructive force equal to the load of 2,000 B-29's and more than 2,000 times the blast power of what previously was the world's most devastating bomb, had been dropped on Japan.

The announcement, first given to the world in utmost solemnity by President Truman, made it plain that one of the scientific landmarks of the century had been passed, and that the "age of atomic energy," which can be a tremendous force for the advancement of civilization as well as for destruction, was at hand....

What happened at Hiroshima is not yet known. The War Department said it "as yet was unable to make an accurate report" because "an impenetrable cloud of dust and smoke" masked the target area from reconnaissance planes. The Secretary of War will release the story "as soon as accurate details of the results of the bombing become available."...

Not the slightest spirit of braggadocio is discernible either in the wording of the official announcements or in the mien of the officials who gave out the news. There was an element of elation in the realization that we had perfected this devastating weapon for employment against an enemy who started the war and has told us she would rather be destroyed than surrender, but it was grim elation. There was sobering awareness of the tremendous responsibility involved....