The US and UK militaries launched strikes against multiple Houthi targets in Houthi-controlled areas of Yemen on Thursday, marking a significant response after the Biden administration and its allies warned that the Iran-backed militant group would bear the consequences of repeated drone and missile attacks on commercial shipping in the Red Sea.

President Joe Biden said he ordered the strikes “in direct response to unprecedented Houthi attacks against international maritime vessels in the Red Sea.”

Biden added that he will “not hesitate to direct further measures to protect our people and the free flow of international commerce as necessary.”