Iran attack on Saudi oil facility likely originated in Southern Iraq

CNN:

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A source with knowledge of the incident told CNN National Security Analyst Peter Bergen late Saturday that preliminary indications were the drones/missiles "did not originate from Yemen and likely originated from Iraq." A second source in the Gulf region told CNN that while there was no proof yet, the indications were that the attack originated in southern Iraq.

Pro-Iranian militia are well-entrenched in southern Iraq, and the Quds Force, the Iranian Revolutionary Guards unit in charge of foreign operations, has a presence there. Earlier this year, some regional analysts assessed that a drone attack on a pumping station at Afif in northern Saudi Arabia originated in Iraq. But no hard evidence was produced.

The Iraqi government Sunday issued a statement rejecting reports "about its land being used to attack Saudi oil facilities."

The Houthis themselves have suggested, without providing any evidence, that they had help from inside the kingdom for these latest attacks. Their spokesman Yahya Saree said the operation followed "an accurate intelligence operation and advance monitoring and cooperation of honorable people inside the kingdom."

Analysts take that to mean elements of the restive Shia population in Saudi Arabia's Eastern Province. Abqaiq lies between the predominantly Shia area of Qatif and Ahsa, which has a substantial minority Shia population. But they caution that it's in the Houthis' interests to try to stir internal tensions and it seems far-fetched that local people could have assisted such an attack.
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The Iranian regime is made up of notorious liars when it comes to trying to avoid responsibility for attacks it initiates.  They are the ones with the most to gain for such attacks and they have the capability that the Houthis lack.