The State Department on Tuesday reinstated the “foreign terrorist organization” designation for Yemen’s Iran-backed Houthi group, fulfilling an order announced by President Donald Trump shortly after he took office.

Secretary of State Marco Rubio announced the department had restored the designation, which carries with it sanctions and penalties for anyone providing “material support” for the group.

“Since 2023, the Houthis have launched hundreds of attacks against commercial vessels in the Red Sea and Gulf of Aden, as well as U.S. service members defending freedom of navigation and our regional partners," Rubio said in a statement. "Most recently, the Houthis spared Chinese-flagged ships while targeting American and allied vessels.”

The Houthis have targeted more than 100 merchant vessels in the critical trade corridor with missiles and drones since the Israel-Hamas war in the Gaza Strip started in October 2023. In January, the group signaled that it will limit its attacks in the Red Sea corridor to only Israeli-affiliated ships after a ceasefire began in the Gaza Strip but warned wider assaults could resume if needed.

Trump’s first Republican administration had similarly designated the Houthis in its waning days, but the designation had been revoked by President Joe Biden's Democratic administration over concerns it would badly affect the delivery of aid to Yemen, which was considered to be facing one of the world’s worst humanitarian crises.

The United Nations said last month that it suspended its humanitarian operations in the stronghold of Yemen’s Houthi rebels after they detained eight more U.N. staffers.

The rebels in recent months have detained dozens of U.N. staffers, as well as people associated with aid groups, civil society and the once-open U.S. Embassy in Sanaa, Yemen’s capital. None of the U.N. staffers has been released.

The Iranian-backed Houthis have been fighting Yemen’s internationally recognized government, which is backed by a Saudi-led coalition, since 2014, when they descended from their stronghold in Saada and took control of Sanaa and most of the north.