A long-awaited update to the U.S. intelligence community’s controversial 2007 National Intelligence Estimate on Iran’s nuclear ambitions has been kicked down the road yet again, Declassified has learned.

The NIE update, expected to bring U.S. spy agencies more into line with their European and Israeli counterparts, was originally supposed to be completed at the end of last year. The target date then slipped to the end of February. But three U.S. national-security officials, who asked for anonymity when discussing the intelligence process, said the document has now been further delayed, at least until the end of March and conceivably further.

The reasons behind the latest delay are murky; two of the officials said the precise reasons for the latest delay are classified. But it is likely that the various intel agencies are still reviewing, revising, and debating the document to reach an agreement about what it should say. In the past, this has been a long and sometimes contentious process. The final product is supposed to reflect the consensus view of U.S. intelligence as a whole, though dissents often pepper the footnotes.