Iran's nuclear activities raise concerns as UN watchdog warns of lack of transparency

Rafael Mariano Grossi, the head of the International Atomic Energy Agency, has expressed concerns about Iran's lack of transparency regarding its nuclear program.

Iran, after the collapse of its 2015 nuclear deal with world powers, has pursued nuclear enrichment just below weapons-grade levels. Tehran has accumulated enough enriched uranium to build several weapons if it chooses. However, U.S. intelligence agencies and others assess that Iran has yet to begin a weapons program. Israel long has been believed to have its own nuclear weapons program.