US President Donald Trump said Iran was probably responsible for a drone attack that forced Saudi Arabia to shut its East-West Pipeline as a precaution. Several drones launched from Iraq struck the pipeline on Thursday, causing injuries and damage, Saudi authorities said. The closure threatens a key route for about 5 million barrels of oil per day that Saudi Arabia has rerouted to Yanbu on the Red Sea since the outbreak of the US-Iran war and the effective closure of the Strait of Hormuz. Trump said he had spoken with Saudi Crown Prince Mohammed bin Salman, while a source told CNN the prince twice urged Trump on Thursday to strike the Iran-backed Houthis, a request Trump declined. The attack followed Houthi advances near the Bab al-Mandeb Strait and added to concerns over Saudi Arabia's oil infrastructure and export capacity.