The International Atomic Energy Agency criticized Iran for making a change to the mode of connection between centrifuge cascades at Fordow without informing the agency beforehand. The agency discovered the change during an unannounced visit and said the failure to inform the IAEA was inconsistent with Iran's safeguards obligations. The change was made to the connection between two cascades of IR-6 centrifuges that were enriching uranium to 60% purity.