US President ‌Donald Trump said on Saturday that Iran was probably responsible for an aerial attack on Saudi Arabia that ​shut down its East-West Pipeline, one of ​the kingdom’s main routes for exporting crude ⁠while bypassing the Strait of Hormuz.

“I ​think they are, probably they are,” Trump told ​reporters in Dublin when asked if Iran was responsible for the attack on the vital oil conduit.

The ​US president also said he had spoken with Saudi Crown Prince Mohammed bin Salman, whom he described as a “good friend.”

The Saudi foreign ministry blamed the attack on several drones from Iraq that it said “caused human injuries and damage.” In a statement carried by the state-run Saudi Press Agency, the kingdom said it would not respond to give the Iraqi government “an opportunity to take the necessary measures.” But it also stressed that Saudi Arabia “reserves the right to take all necessary measures to protect its sovereignty, its security, its facilities,” and its inhabitants.

The Iraqi government condemned the assault, with the prime minister’s office announcing the dismissal of a military commander after investigations confirmed the attack originated from Iraq. Two Iraqi sources later told Reuters that Iraq ordered the closure of the Shalamcheh border crossing with Iran as a precautionary measure, adding that a wide-scale operation was underway to pursue the perpetrators of the attack.