DUBAI — Iran and the United States remain at loggerheads over efforts to agree a permanent end to the war in the Gulf, according to a senior Iranian source, who said there had been no progress in talks to revive the interim deal agreed in June and define a time frame to implement it. The comments were a further blow to hopes for a resolution to the crisis, following new attacks on shipping in the region on Tuesday. The deal agreed in June declared an "immediate and permanent termination of military operations on all fronts", but quickly unravelled, with U.S. President Donald Trump saying it was "over" on July 7 and Iran's foreign ministry declaring it "suspended" a week later. The U.S. accuses Iran of failing to honour an agreement under the deal to reopen the vital Strait of Hormuz shipping route. Tehran says Washington has reneged on its commitments, including lifting a blockade of Iranian ports and releasing frozen Iranian assets. "One of the issues that is being discussed via mediators is the U.S. returning to the interim agreement and defining a timeframe for implementing the comm