The United States and Iran reported progress in their latest round of nuclear talks on Saturday and agreed to meet again next week as they pursue a deal that could help ease soaring Middle East tensions.

A US official called the talks "positive and productive", and Iran's top diplomat said the two sides will study how to narrow their differences on a range of subjects before next week's fourth round.

The highest-level contact in years between the long-time foes is targeting a new deal that would stop Iran developing nuclear weapons -- an objective Tehran denies pursuing -- in return for relief from sanctions.

"There is still much to do, but further progress was made on getting to a deal," the senior US official said on condition of anonymity, adding that the next talks would be in Europe.

Iranian Foreign Minister Abbas Araghchi called Saturday's talks, which included technical-level teams for the first time, "serious and businesslike".

"There are differences both in the major issues and in the details," he told Iranian state TV.

"Until the next meeting, further studies are to be conducted in the capitals on how to reduce the differences."

Araghchi added: "I think our........

© Al Monitor