The United States and Iran have agreed to a deal in principle to wind down the war in the Middle East and end the Iranian blockade of the Strait of Hormuz, a senior U.S. official said Sunday, although some of the most sensitive issues have yet to be resolved.

There were no immediate public statements from Iran about a deal being reached, and Iranian officials over the last 24 hours offered some conflicting depictions of what a potential agreement might contain. The U.S. official said a deal had not yet been signed and was still subject to final approval from President Trump and Iran’s supreme leader, which could take days.