Oman’s foreign minister says there will be a sixth round of negotiations between Iran and the United States over Tehran’s rapidly advancing nuclear program this weekend.

Iranian, Egyptian and U.N. leaders have met to discuss Iran’s nuclear program after the U.N. nuclear watchdog agency said Iran is increasing its stockpile of uranium enriched to near weapons-grade levels.

The Iranian Foreign Minister says he has spoken by phone with the director of the U.N.’s nuclear watchdog agency after a report from the agency said Iran is further increasing its stockpile of uranium enriched to near weapons-grade levels.

Mediator Oman says Iran and the United States made “some but not conclusive progress” in a fifth round of negotiations in Rome over Tehran’s rapidly advancing nuclear program.

Iran and the United States have held a fourth round of talks over Tehran’s rapidly advancing nuclear program.

President Donald Trump is threatening sanctions on anyone who buys Iranian oil.

A person with knowledge of the discussions told The Associated Press that the third round of talks between Iran and the United States over Tehran’s rapidly advancing nuclear program have ended.

A U.S. official says President Donald Trump’s envoy Steve Witkoff has held both “direct and indirect” discussions with Iranian Foreign Minister Abbas Araghchi in Rome.

Iran and the United States will hold more negotiations next week over Tehran’s rapidly advancing nuclear program.