The United Nations atomic agency said Iran worked on a nuclear-weapons program in the past, but U.S. officials said that conclusion wouldn’t block the lifting of sanctions under July’s nuclear deal.

While the International Atomic Energy Agency’s conclusion about Iran’s past weapons work was by far its most conclusive, questions remain over the extent of Tehran’s cooperation with the five-month probe.

The agency said it believed Iran had a coordinated nuclear-weapons program until 2003 and that some of these activities continued as late as 2009.

However, it said there were no credible indications of nuclear-weapons-related activities in Iran after 2009. It also said Iran’s work was focused on less-advanced activities like feasibility and scientific studies and the acquisition of specific areas of weapons-related capabilities.​