Iran lashes out at Austria after a report claims Tehran has an advanced nuclear weapons program, sparking diplomatic tensions ...

The U.N. nuclear watchdog says Iran has further increased its stockpile of uranium enriched to near weapons-grade levels.

Rafael Mariano Grossi, the director-general of the International Atomic Energy Agency, speaks to journalists at the agency in ...

UN nuclear watchdog warns Tehran could be close to weapons-grade enriched uranium, as negotiations with the US continue.

Rafael Mariano Grossi, director-general of the International Atomic Energy Agency, speaks Wednesday to journalists attending a weeklong seminar at the agency in Vienna, Austria.

VIENNA: Iran carried out secret nuclear activities with material not declared to the UN nuclear watchdog at three locations ...

Iran's foreign ministry and the Iranian nuclear agency rejected the report, calling it "politically motivated" in a joint ...

Iran previously carried out secret nuclear activities with material not declared to the U.N. nuclear watchdog at three ...

Findings include 2003 tests of detonator for nuclear bomb; UN watchdog also says Tehran now has enough uranium, if enriched ...

The report came as U.S. President Donald Trump's administration seeks to reach a deal with Tehran to limit its nuclear ...