Two-thirds of the UN nuclear watchdog’s 35-nation Board of Governors endorsed a non-binding statement by the United States, Britain, France and Germany on Wednesday pressing Iran to explain why uranium traces were found at three undeclared sites. At its last quarterly meeting in June the International Atomic Energy Agency’s Board of Governors passed a resolution expressing “profound concern” that the traces remain unexplained due to insufficient cooperation by Iran, and calling on Tehran to engage with the watchdog “without delay”. The Vienna-based IAEA says there has been no progress and no e…