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Iran, 6 world powers launch new round of nuclear talks ahead of end of June deadline

  • In this picture released by an official website of the office of the Iranian supreme leader on Wednesday, May 20, 2015, Supreme Leader Ayatollah Ali Khamenei reviews Revolutionary Guard cadets in a graduation ceremony in Tehran, Iran. Iran's supreme leader vowed Wednesday he will not allow international inspection of Iran's military sites or access to Iranian scientists under any nuclear agreement with world powers. (Office of the Iranian Supreme Leader via AP)

    In this picture released by an official website of the office of the Iranian supreme leader on Wednesday, May 20, 2015, Supreme Leader Ayatollah Ali Khamenei reviews Revolutionary Guard cadets in a graduation ceremony in Tehran, Iran. Iran's supreme leader vowed Wednesday he will not allow international inspection of Iran's military sites or access to Iranian scientists under any nuclear agreement with world powers. (Office of the Iranian Supreme Leader via AP)  (The Associated Press)

  • In this picture released by an official website of the office of the Iranian supreme leader on Wednesday, May 20, 2015, Supreme Leader Ayatollah Ali Khamenei, second left, reviews Revolutionary Guard cadets in a graduation ceremony in Tehran, Iran, as he is accompanied by army commander Ataollah Salehi, left. Iran's supreme leader vowed Wednesday he will not allow international inspection of Iran's military sites or access to Iranian scientists under any nuclear agreement with world powers. (Office of the Iranian Supreme Leader via AP)

    In this picture released by an official website of the office of the Iranian supreme leader on Wednesday, May 20, 2015, Supreme Leader Ayatollah Ali Khamenei, second left, reviews Revolutionary Guard cadets in a graduation ceremony in Tehran, Iran, as he is accompanied by army commander Ataollah Salehi, left. Iran's supreme leader vowed Wednesday he will not allow international inspection of Iran's military sites or access to Iranian scientists under any nuclear agreement with world powers. (Office of the Iranian Supreme Leader via AP)  (The Associated Press)

  • In this picture released by an official website of the office of the Iranian supreme leader on Wednesday, May 20, 2015, Supreme Leader Ayatollah Ali Khamenei speaks in a graduation ceremony of Revolutionary Guard officers in Tehran, Iran. Iran's supreme leader vowed Wednesday he will not allow international inspection of Iran's military sites or access to Iranian scientists under any nuclear agreement with world powers. (Office of the Iranian Supreme Leader via AP)

    In this picture released by an official website of the office of the Iranian supreme leader on Wednesday, May 20, 2015, Supreme Leader Ayatollah Ali Khamenei speaks in a graduation ceremony of Revolutionary Guard officers in Tehran, Iran. Iran's supreme leader vowed Wednesday he will not allow international inspection of Iran's military sites or access to Iranian scientists under any nuclear agreement with world powers. (Office of the Iranian Supreme Leader via AP)  (The Associated Press)

Experts from Iran and six world powers are launching a new round of negotiations focused on reaching a deal that curbs Iran's nuclear program.

Diplomats said ahead of Wednesday's meeting that progress is being made but significant gaps remain on a main document and technical annexes ahead of an end-of-June deadline.

Iran's team is led by Deputy Foreign Minister Abbas Araghchi. EU official Helga Schmidt is heading the other side. Senior officials from the U.S., Russia, China, Britain, France and Germany may join in later.

The deal aims for strict limits on Iranian nuclear capabilities that could be used to make weapons. Tehran denies any interest in such arms but is negotiating for a lifting of sanctions.

The diplomats demanded anonymity because they are not authorized to discuss the talks.