By Parisa Hafezi MUSCAT (Reuters) -Top Iranian and U.S. negotiators began a new round of indirect talks on Saturday to hammer out a deal curbing Tehran's 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.

Representatives from both sides in Oman called the meeting productive and are expected to sit down again for the fourth time, possibly as soon as next week.