Oil prices jumped sharply on Monday following an attack over the weekend on two Saudi Arabian oil-processing centers. The attacks endangered world oil supplies. Houthi rebels in Yemen claimed responsibility for the attacks, which appear to have used drones against the Saudi Aramco oil centers. The Houthi rebels have links to Iran. The Houthis said they used 10 drones to cause huge fires at the Abqaiq and Khurais oil centers in eastern Saudi Arabia. The incident cut Saudi oil production by more than 50 percent. That is estimated to be about five percent of total world oil production. Saudi officials say the country will not return to normal production for weeks. By midday on Monday, oil prices had increased by more than 10 percent on world markets.