Brent crude oil traded above $100 a barrel on Tuesday for the first time in three months, after Iran-backed Houthi fighters struck oil facilities in southern Saudi Arabia.
The benchmark reached $100.03. A brief move above the line in late July reversed the same session, leaving May as the last time Brent held $100.
Houthi forces launched dozens of drones and ballistic missiles at Abha, Jazan, Najran and Khamis Mushait on Tuesday.
Fires broke out at Saudi Aramco sites and 73 people were wounded, including women and children. Jazan hosts a refinery that processes 400,000 barrels a day.
Saudi military spokesman Maj. Gen. Turki al-Malki called the assault a serious escalation and promised deterrent measures.