A senior UN official has said that his team made headway during talks in Tehran meant to restart an investigation into suspicions the Islamic Republic may have secretly worked on a nuclear arms programme.
Herman Nackaerts said the progress means the UN nuclear agency expects to resume its investigation early next year.
Iran denies any interest in nuclear weapons.
Mr Nackaerts said "we were able to make progress" on resuming the investigation.
He added that the IAEA expects to "start implementing" an agreement on the investigation shortly after new talks in Tehran on January 16.