By Parisa Hafezi DUBAI (Reuters) -Fresh talks between Iranian and U.S. negotiators to resolve disputes over Tehran's nuclear programme ended in Oman on Sunday with further negotiations planned, officials said,

Iran described the latest meeting as "difficult but useful," while a senior U.S. official, speaking to AFP on condition of anonymity, said Washington was "encouraged by today's outcome and look forward to our next meeting,

Iran and the United States will meet again this weekend for talks over Tehran’s rapidly advancing nuclear program.