Top Iranian and U.S. negotiators will meet again on Saturday to hammer out a new deal curbing Tehran's advancing nuclear programme, while U.S. President Donald Trump signalled confidence in clinching a new pact that would block Iran's path to a nuclear bomb.

Negotiations between Iran and the United States over Tehran's rapidly advancing nuclear program will return on Saturday to the secluded sultanate of Oman, where experts on both sides will start hammering out the technical details of a possible deal.

Plans for a third round of talks in three weeks have raised hopes for an Iran nuclear accord, which could avert a new Mideast conflict. President Trump said he believed a deal was within reach.