Brent futures hit a session high of $110 a barrel before easing to close at $109.86, a gain of 3.7%. US West Texas Intermediate rose 3.5% to settle at $101.41, adding more than 10% over the week, while Brent gained nearly 5%.
Saudi Arabia said it intercepted several missiles fired over the Red Sea on Friday, including one heading towards the oil export terminal at Yanbu, and destroyed three drones near Riyadh and in the kingdom's southern regions. Iran-allied Houthi militants in Yemen have fired repeatedly at Saudi Arabia this week. An administrative building belonging to oil giant Aramco in Dhahran was hit on Tuesday, according to the Saudi energy ministry, and an attack on Riyadh's international airport on October 10 killed 12 people and injured more than 300.
In the Strait of Hormuz, at least nine tankers and cargo ships have come under attack since Sunday as Iran moves to choke off oil exports through the waterway. Iran sank the Singapore-registered container ship GFS Pride on Wednesday, US Central Command said, with the crew safely evacuated. The International Maritime Organization reported three seafarers injured and two missing this week.
Crude exports through Hormuz stood at 9.4 million barrels per day in the week ended Wednesday, about 70% of the average before the Iran war, according to energy researcher Kpler. The 'energy ceasefire' that President Donald Trump tried to broker between Ukraine and Russia has also quickly unraveled, with Ukraine vowing to keep striking Russian refineries. Analysts at Rapidan Energy said three conflicts are now impacting energy flows and fixed energy infrastructure.