Iran did work related to developing nuclear arms in the past, the U.N. atomic agency concluded in a report Wednesday that wraps up a near decade of investigations and opens the way to implementing a landmark deal aimed at reducing any future nuclear threat from Tehran.

Iran has consistently denied any interest in nuclear arms or past work on such weapons, and Iranian Deputy Foreign Minister Abbas Araqhchi told Iranian television that the International Atomic Energy Agency report “confirms the peaceful nature” Iran’s nuclear program.

But the report contested that view and came down on the side of U.S. allegations, saying the agency “assesses that a range of activities relevant to the development of a nuclear explosive device were conducted in Iran prior to the end of 2003 as a coordinated effort, and some activities took place” up to 2009. […]