UN Secretary-General Kofi Annan has expressed his condolences on the death of Joseph Rotblat, who is the scientist, veteran disarmament campaigner and Nobel Peace Laureate, UN spokeswoman Marie Okabe said Friday.

In a statement issued by the spokeswoman, Annan said he was saddened to learn of the death of Rotblat.

"In a long life, Rotblat went from working on the nuclear bomb to founding the Pugwash conference, and continued for the rest of his days to champion the principle of scientists taking responsibility for their inventions," the statement said.

"He leaves a legacy of inspiration and courage to his many friends and colleagues around the world," Annan noted.

Source: Xinhua