A 93-year-old Japanese man has become the first person certified as a survivor of both US atomic bombings at the end of World War II, officials said Tuesday. Tsutomu Yamaguchi had already been a certified "hibakusha," or radiation survivor, of the August 9, 1945, atomic bombing in Nagasaki, but has now been confirmed as surviving the attack on Hiroshima three days earlier as well, city officials said. Yamaguchi was in Hiroshima on a business trip on August 6, 1945, when a US B-29 dropped an atomic bomb on the city. He suffered serious burns to his upper body and spent the night in the city. He then returned to his hometown of Nagasaki just in time for the second attack, city officials said. "As far as we know, he is the first one to be officially recognized as a survivor of atomic bombings in both Hiroshima and Nagasaki," Nagasaki city official Toshiro Miyamoto said. "It's such an unfortunate case, but it is possible that there are more people like him."