Yemen’s Iran-backed Houthi rebels say they have attacked two Saudi oil tankers in the Red Sea, potentially widening the war as international oil topped $100 a barrel. The Houthis have threatened to shut down another key trade route, with the world economy already reeling from Iran’s closure of the Strait of Hormuz. Iran and the U.S. have stepped up their attacks as they vie for control of the strait. Iran’s foreign minister said Tehran would adopt an “eye for an eye” policy on U.S. strikes against its infrastructure. U.S. Secretary of State Marco Rubio retorted that President Donald Trump’s policy is “a head for an eye.”