Yemen's Houthis will not "dial down" their action against Israeli shipping in the Red Sea in response to U.S. military pressure or appeals from the group's allies such as Iran, the Yemeni militant group's foreign minister said.

The United States and Iran-backed Houthi rebels in Yemen are both vowing escalation after the U.S. launched airstrikes to deter the rebels from attacking military and commercial vessels on one of the world's busiest shipping corridors.