A drone attack is being blamed for knocking out half of Saudi Arabia's oil production. Yemen's Houthi rebels took credit for Saturday's attacks east of Riyadh, which set fire to the world's biggest oil processing plant. Secretary of State Mike Pompeo condemned Iran after the attacks, and said Iran will be held accountable for its aggression. Iran's foreign ministry called Pompeo's remark a "blind accusation," and dismissed it as "meaningless."