USA TODAY | Oil prices tumble on Iran nuclear accord USA TODAY Oil prices tumbled Tuesday after Iran and six world powers reached a nuclear accord that clears the way for Tehran to unleash its oil onto world markets at levels not seen since the West imposed sanctions. Brent crude and West Texas Intermediate, or ... What Iran's Nuclear Deal Means for the Global Crude Oil Market Oil Prices Slide on Iran Nuclear Deal Crude oil slides to three-month low after Iran deal |