Because Iran has every reason to attack Saudi oil fields. The attack on Saudi oil field leads to the reduction of oil production in Beach oil field, and the biggest beneficiary will be Iran, which can pay more by increasing foreign exchange income. Therefore, the United States believes that Iran has attacked Saudi oil fields, and so does Saudi Arabia.

Two oil facilities of Saudi Aramco, the world's largest oil company, caught fire after being attacked by drones. After the incident, Saudi Arabia and the United States accused Iran of being behind the scenes, but the Tehran government denied its participation. US Secretary of State Pompeo said that Iran should be responsible for the drone attack on important facilities in oil-rich areas in eastern Saudi Arabia. It is understood that the attack forced Saudi Arabia to cut its oil production by half on Saturday.

This means that it will affect the output of nearly 5 million barrels of crude oil, accounting for about 5% of the world's daily oil output. Pompeo called it an unprecedented attack on the world's energy supply. Two oil facilities of Saudi Aramco, the world's largest oil company, caught fire after being attacked by drones. After the incident, the Houthi armed group in Yemen pleaded guilty on the same day, claiming that it used 10 drone to attack, and warned Saudi Arabia to stop attacking Yemen, otherwise the situation would get worse. After the incident, Saudi Arabia and the United States accused Iran of being behind the scenes, but the Tehran government denied its participation.

The attack on Saudi oil fields has led to a decline in Saudi oil production, which may trigger a global oil crisis. This time, Iran has every reason to reduce oil production because of the attack on Saudi oil fields on Monday, which can promote Iran's oil exports. But the Iranian government denies it.