The Hiroshima bomb is the most devastating to have been used in real combat. But today’s nuclear weapons are far, far more powerful

HIROSHIMA, Japan (Reuters) -Exactly 80 years since an atomic bomb was used in war for the first time, thousands bowed their heads in prayer in Hiroshima on Wednesday, as the city's mayor warned world leaders about the nuclear warheads that still exist today.

Eighty years after the atomic bombings of Hiroshima and Nagasaki, many of the remaining Japanese survivors are increasingly frustrated by growing nuclear threats and the acceptance of nuclear weapons by global leaders.