Iran has finished installing nearly 3,000 nuclear-fuel production machines at its underground military facility near the holy city of Qom, providing Tehran the capability to double its production of medium-enriched uranium in the coming months, a new report said.

These advances, outlined in a report on Iran by the International Atomic Energy Agency, the United Nations nuclear watchdog, could allow Tehran's Islamist leaders to accumulate in as little as three to four months enough uranium enriched to 20% purity for one atomic...