On Aug. 6, 1945, the U.S. dropped an atomic bomb on Hiroshima and three days later, dropped another one on Nagasaki.

On the 80th anniversaries of the Hiroshima and Nagasaki bombings, survivors continue searching for remains and healing—and Americans remain divided over whether the bombings were justified.

Dozens of people — including peace activists, members of faith groups, and musicians — gathered on Wednesday to raise alarm about the continuing nuclear threat worldwide.