Update2: Despite US officials repeatedly over the weekend claiming they were "certain" attacks came from Iraqi soil, likely from Iran-backed militias acting as proxies, they've now changed their tune to line up behind the latest Saudi military assessment. 

US officials have told FOX that the attacks originated from Iranian soil, which is the first time such a direct charge has been issued since the early Saturday morning crisis.

Meanwhile in this rapidly changing who dunnit narrative, one key piece of recent history should not be forgotten after the Saudis announced Monday their belief that "Iranian weapons" were behind the attack, based on an initial investigation: