With the fourth round of Iran-US talks over Tehran’s nuclear programme postponed, uncertainty looms large over achieving a constructive deal. Even though the dialogues were taking place, tensions have also been simmering between both nations.

The talks seek to limit Iran's nuclear program in exchange for the lifting of some of the crushing economic sanctions the U.S. has imposed on the Islamic Republic.

MUSCAT, Oman — Iran and the United States held their first technical-level talks on Tehran’s rapidly advancing nuclear program Saturday, a more complex phase of their high-stakes negotiations.