U.S. intelligence agencies are quietly revising their widely disputed assertion that Iran has no active program to design or build a nuclear bomb. Three U.S. and two foreign counterproliferation officials tell NEWSWEEK that, as soon as next month, the intel agencies are expected to complete an “update” to their controversial 2007 National Intelligence Estimate, which concluded that Tehran “halted its nuclear weapons program” in 2003 and “had not restarted” it as of mid-2007. The officials, who asked for anonymity to discuss sensitive information, say the revised report will bring U.S. intel agencies more in line with other countries’ spy agencies (such as Britain’s MI6, Germany’s BND, and Israel’s Mossad), which have maintained that Iran has been pursuing a nuclear weapon.

Yet two of the U.S. sources caution the new assessment will likely be “Talmudic” in its parsing. They say U.S. analysts now believe that Iran may well have resumed “research” on nuclear weapons–theoretical work on how to design and construct a bomb–but that Tehran is not engaged in “development”–actually trying to build a weapon.