On August 6, 1945, the United States dropped the atomic bomb on Hiroshima, killing about 140,000 out of the 350,000 who lived in the city. Three days later, a second atomic bomb was dropped on Nagasaki. The 70th anniversary of the world’s first nuclear attack was marked this week and Reuters photographer Issei Kato sourced archive images of the cities in the aftermath of the bombing and revisited the same locations today. People gathered this week to mourn the attacks that killed more than 200,000 in Japan.

An elderly Hiroshima resident lights a candle of her grand daughter's paper lantern to prepare for a lantern procession to comfort souls of victims killed by the atomic bombing in front of the Atomic Bomb Dome at Hiroshima Peace Memorial Peace Park, in Hiroshima, western Japan, August 5. (Kimimiasa Mayama/EPA)