U.N. Says Iran Has Enough Uranium to Produce Nuclear Weapon

BRUSSELS—The United Nations atomic agency said Monday that Iran hasn’t offered credible answers to its probe into nuclear material found in the country and reported that Iran’s stockpile of highly enriched uranium has grown to roughly enough material for a nuclear bomb.

The two reports, circulated to agency member states and seen by The Wall Street Journal, will sharpen concerns about Iran’s nuclear work at the same time negotiations on reviving the 2015 nuclear deal have stalled. That agreement placed tight but temporary restrictions on Iran’s nuclear work in exchange for lifting most international sanctions.