The US has released satellite images and cited intelligence to back its claim, that Iran was behind attacks on major Saudi oil facilities.
Iran however, denies involvement in the air attacks, which were claimed by Houthi rebels in Yemen.
Reports however say the direction and extent of the attacks cast doubt on Houthi involvement.
The incident has cut global oil supplies by 5 percent leading to a soar in prices.
President Donald Trump in a tweet suggested possible military action once the perpetrator is known.