5 things to know as Hiroshima marks 75th A-bomb anniversary FILE - In this Aug. 6, 1945, file photo, smoke rises 20,000 feet above Hiroshima, western Japan, after the first atomic bomb was dropped during warfare. Hiroshima was targeted because it was a major Japanese military hub filled with military bases and ammunition facilities. The city of Hiroshima on Thursday, Aug. 6, 2020 marks the 75th anniversary of the worlds first nuclear attack. (AP Photo, File)
FILE - In this Aug. 7, 1945, file photo, Col. Paul W. Tibbets, standing, pilot of the B-29 Enola Gay which dropped the atomic bomb on Hiroshima, western Japan, describes the flight during a news conference at Strategic Air Force headquarters on Guam, one day after the atomic bombing. At 8:15 a.m., the U.S. B-29 bomber Enola Gay dropped the 4-ton Little Boy uranium bomb from a height of 9,600 meters (31,500 feet) on the city center, targeting the Aioi Bridge. (AP Photo/Max Desfor, File)
FILE - In this Aug. 6, 1945, file photo, survivors are seen as they receive emergency treatment by military medics shortly after the first atomic bomb ever used in warfare was dropped by the United States over Hiroshima, western Japan. Many people exposed to radiation developed symptoms such as vomiting and hair loss. Most of those with severe radiation symptoms died within three to six weeks. Others who lived beyond that developed health problems related to burns and radiation-induced cancers and other illnesses. (AP Photo, File)
FILE - In this Sept. 8, 1945, file photo, an allied correspondent stands in a sea of rubble before the shell of a building that once was a movie theater in Hiroshima, western Japan, a month after the first atomic bomb ever used in warfare was dropped by the U.S. to hasten Japan's surrender. Many people exposed to radiation developed symptoms such as vomiting and hair loss. Most of those with severe radiation symptoms died within three to six weeks. Others who lived beyond that developed health problems related to burns and radiation-induced cancers and other illnesses. (AP Photo/Stanley Troutman, Pool, File)
The Atomic Bomb Dome is seen at dusk in Hiroshima, western Japan, Monday, Aug. 3, 2020. The city of Hiroshima on Thursday, Aug. 6 marks the 75th anniversary of the worlds first nuclear attack. (AP Photo/Eugene Hoshiko)
The Atomic Bomb Dome is seen at dusk in Hiroshima, western Japan, Sunday, Aug. 2, 2020. The city of Hiroshima on Thursday, Aug. 6 marks the 75th anniversary of the worlds first nuclear attack. (AP Photo/Eugene Hoshiko)
The Atomic Bomb Dome is seen at dusk in Hiroshima, western Japan, Sunday, Aug. 2, 2020. The city of Hiroshima on Thursday, Aug. 6 marks the 75th anniversary of the worlds first nuclear attack. (AP Photo/Eugene Hoshiko)
A man looks at the Atomic Bomb Dome in Hiroshima, western Japan, Sunday, Aug. 2, 2020. The city of Hiroshima on Thursday, Aug. 6 marks the 75th anniversary of the worlds first nuclear attack. (AP Photo/Eugene Hoshiko)
Hatsue Onda, center, is helped by Kengo Onda to offer strings of colorful paper cranes to the victims of the 1945 Atomic bombing near Hiroshima Peace Memorial Museum in Hiroshima, western Japan, Monday, Aug. 3, 2020. The origami cranes that can be seen throughout the city became a symbol of peace because of atomic bomb survivor Sadako Sasaki, who, while battling leukemia, folded similar cranes using medicine wrappers after hearing an old Japanese story that those who fold a thousand cranes are granted one wish. (AP Photo/Eugene Hoshiko)
FILE - In this Aug. 6, 1945, file photo released by US Air Force, a column of smoke rises 20,000 feet over Hiroshima, western Japan, after the first atomic 5-ton "Little Boy" bomb was released. Hiroshima was targeted because it was a major Japanese military hub filled with military bases and ammunition facilities. The city of Hiroshima on Thursday, Aug. 6, 2020 marks the 75th anniversary of the worlds first nuclear attack. (George R. Caron/US Air Force via AP, File)
FILE - In this Aug. 6, 1945, file photo released by the U.S. Air Force, white smoke rises from detonation of the atomic bomb over Hiroshima, western Japan. At 8:15 a.m., the U.S. B-29 bomber Enola Gay dropped the 4-ton Little Boy uranium bomb from a height of 9,600 meters (31,500 feet) on the city center, targeting the Aioi Bridge. The bomb exploded 43 seconds later, 600 meters (2,000 feet) above the ground. (U.S. Air Force via AP, File)
FILE - This Aug. 6, 1945, file photo released by the U.S. Air Force shows the total destruction of Hiroshima, western Japan, as the result of the first atomic bomb dropped. An estimated 140,000 people, including those with radiation-related injuries and illnesses, died through Dec. 31, 1945. That was 40% of Hiroshimas population of 350,000 before the attack. (U.S. Air Force via AP, File)
FILE - In this Sept. 7, 1945, file photo, an unidentified man stands next to a tiled fireplace where a house once stood in Hiroshima, western Japan. The Aug. 6, 1945, bombing was the worlds first nuclear attack. An estimated 140,000 people, including those with radiation-related injuries and illnesses, died through Dec. 31, 1945. That was 40% of Hiroshimas population of 350,000 before the attack. (AP Photo/Stanley Troutman, Pool, File)
FILE - In this Sept. 5, 1945, file aerial photo, the landscape of Hiroshima, western Japan, shows widespread rubble and debris, one month after the atomic bomb was dropped. An estimated 140,000 people, including those with radiation-related injuries and illnesses, died through Dec. 31, 1945. That was 40% of Hiroshimas population of 350,000 before the attack. (AP Photo/Max Desfor, File)
FILE - In this Aug 8, 1945, photo, soldiers and civilians walk through the grim remains of Hiroshima, western Japan, two days after the atomic bomb explosion. The building on left with columned facade was the Hiroshima Bank. To its right, with arched front entrance, was the Sumitomo Bank. An estimated 140,000 people, including those with radiation-related injuries and illnesses, died through Dec. 31, 1945. That was 40% of Hiroshimas population of 350,000 before the attack. (AP Photo, File)
FILE - In this Sept. 8, 1945, file photo released by U.S. Air Force, two people walk on a cleared path through the destruction resulting from the Aug. 6 detonation of the first atomic bomb in Hiroshima, Japan. An estimated 140,000 people, including those with radiation-related injuries and illnesses, died through Dec. 31, 1945. That was 40% of Hiroshimas population of 350,000 before the attack. (U.S. Air Force via AP, File)
FILE - In this Aug. 6, 1945, file photo, the "Enola Gay" Boeing B-29 Superfortress lands at Tinian, Northern Mariana Islands, after the U.S. atomic bombing mission against the Japanese city of Hiroshima. Enola Gay dropped the 4-ton Little Boy uranium bomb from a height of 9,600 meters (31,500 feet) on the city center, targeting the Aioi Bridge. (AP Photo/Max Desfor, File)
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FILE - In this Aug. 6, 1945, file photo, smoke rises 20,000 feet above Hiroshima, western Japan, after the first atomic bomb was dropped during warfare. Hiroshima was targeted because it was a major Japanese military hub filled with military bases and ammunition facilities. The city of Hiroshima on Thursday, Aug. 6, 2020 marks the 75th anniversary of the worlds first nuclear attack. (AP Photo, File)