The southern Japanese city of Nagasaki on Saturday marked 80 years since the U.S. atomic attack that killed tens of thousands and left survivors who hope their harrowing memories can help make their hometown the last place on Earth to be hit by a nuclear bomb.

Thousands bowed their heads in prayer in Nagasaki on Saturday to mark the 80th anniversary of the city's atomic bombing, as the mayor warned that current global conflicts could push the world again into nuclear war.