A 93-year-old Japanese man has become the first person to be certified as a survivor of both US atomic bombings at the end of the second world war, officials said today.

Tsutomu Yamaguchi had already been a certified "hibakusha," or radiation survivor, of the 9 August 1945 atomic bombing in Nagasaki. Now it has been confirmed that he also survived the attack on Hiroshima three days earlier.

Yamaguchi was in Hiroshima on a business trip on 6 August 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.

"As far as we know, he is the first one to be officially recognised as a survivor of atomic bombings in both Hiroshima and Nagasaki," said Nagasaki city official Toshiro Miyamoto. "It's such an unfortunate case, but it is possible that there are more people like him."

Certification qualifies survivors for government compensation including monthly allowances, free medical checkups and funeral costs. Miyamoto said Yamaguchi's compensation would not increase.

Japan is the only country to have suffered atomic bomb attacks. About 140,000 people were killed in Hiroshima and 70,000 in Nagasaki.

Yamaguchi is one of about 260,000 people who survived the attacks. Bombing survivors have developed various illnesses from radiation exposure, including cancer and liver illnesses. Details of Yamaguchi's health problems were not released.

Thousands of survivors continue to seek official recognition after the government rejected their eligibility for compensation. Last year, it eased the requirements for being certified as a survivor, following criticism the rules were too strict and neglected many who had developed illnesses that doctors have linked to radiation.