Iran and the United States concluded a fifth round of high-stakes nuclear talks in Rome on Friday amid growing skepticism in Tehran about the chances of a deal as Washington hardens its position.

ROME (AP) — Iran and the United States prepared for a fifth round of negotiations over Tehran’s rapidly advancing nuclear program Friday in Rome, with enrichment emerging as the key issue.

The fifth round of nuclear talks between the U.S. and Iran in Rome ended Friday with "some but not conclusive progress," according to Oman's Foreign Minister Badr al-Busaidi, who is mediating between the parties.