An Iranian diplomatic official says Foreign Minister Mohammad Javad Zarif will lead nuclear talks with world powers, taking over from the country's national security council.

Since the election of centrist Hassan Rohani as president in June, Iran says it is taking a new approach to negotiations with a six-nation group — the five permanent members of the UN Security Council plus Germany.

Iranian officials say they'll abandon the bombastic language used under Rohani's predecessor, Mahmoud Ahmadinejad. But they also say Iran will continue its disputed nuclear activities.

"The nuclear dossier has been transferred to the Foreign Ministry," the official said Tuesday. He spoke anonymously as he wasn't authorized to speak publicly on the issue

Recently, a top adviser to Iran's supreme leader says the election of centrist Hassan Rohani as the country's president gives an opportunity to world powers to reach a deal with Iran over its nuclear program — but that Tehran will never again suspend its nuclear activities.

Ali Akbar Velayati, who advises Ayatollah Ali Khamenei on key matters including the nuclear issue, told The Associated Press that the onus was on the West to reach out to Iran, but pledged that Iran would respond with a "different language" from the bombastic rhetoric used by Rohani's predecessor, Mahmoud Ahmadinejad.