A senior U.N. nuclear agency official urged Iran on Monday to allow access to sites, people and documents it seeks in its probe of suspicions that Tehran conducted secret research into nuclear

A drawing based on information from inside an Iranian military site shows an explosives containment chamber of the type needed for nuclear arms-related tests that U.N. inspectors suspect Tehran

As international tensions rise over a planned North Korean rocket launch, the U.N. nuclear agency is taking a wait-and-see attitude on an offer from the North to allow agency experts back into the