The U.N. nuclear agency closed the books Tuesday on its decade-long probe of allegations that Iran worked on atomic arms, and Tehran proclaimed that it would implement commitments within weeks to cut back on present nuclear programs that could be used to make such weapons. The probe had to be formally ended as part of a deal between Iran and six nations that involves the removal of economic sanctions. A resolution was approved by consensus of the 35-nation board of the U.N.'s International Atomic Energy Agency. The move means that some questions about the alleged weapons work may never be...