Saudi Arabia's Aramco, one of the biggest companies in the world, was hit by armed unmanned aerial vehicles (UAVs), also known as drones. A total of 18 drones and seven missiles were launched against the Saudi infrastructure. The attack was the worst on Middle Eastern oil facilities since Saddam Hussein set fire to Kuwait's oil wells in 1990. The attack knocked out 5% of the world's oil supply, and oil prices increased almost 20% as a result. Even though the attacks were claimed by Houthi rebels, Saudi Arabian officials blamed Iran, at least for providing weapons to the Houthis. Some officials even claimed that Iran was directly involved in the attacks.