Catching up I found this Long War Journal report, dated May 12th 2014:
In a response to al Qaeda emir Ayman al Zawahiri's latest attempt at reconciliation with the Islamic State of Iraq and the Sham, ISIS spokesman Abu Muhammad al Adnani made a startling admission: Al Qaeda has ordered its fighters and branches to refrain from attacking the Iranian state in order to preserve the terror group's network in the country.