DUBAI, United Arab Emirates (AP) — The U.S. military said Saturday that it launched new airstrikes against Iran to “swiftly punish” the country’s Revolutionary Guard for an attack in Jordan that killed two American service members, left one missing and four requiring hospitalisation.

The strikes were designed to further degrade Iran’s ability to restrict the traffic of oil tankers through the Strait of Hormuz, the U.S. Central Command said. The waterway accounted for roughly 20% of global oil supplies before the war.

The new strikes came after the U.S. military announced its first troop deaths due to direct Iranian fire since the opening days of the war, following a drone and missile attack on a base in Jordan on Friday. The dead were not identified.