Japan on Sunday marked the 78th anniversary of the U.S. atomic bombing on Hiroshima, where its mayor urged the abolition of nuclear weapons and called the Group of Seven leaders' notion of nuclear deterrence a "folly".

TOKYO, Aug 6 (Reuters) - Japan on Sunday marked the 78th anniversary of the U.S. atomic bombing on Hiroshima, where its mayor urged the abolition of nuclear weapons and called the Group of Seven leaders’ notion of nuclear deterrence a “folly”.