Who are the Houthis and why did the US and UK retaliate for attacks?

ViewWhen U.S. and U.K. warships and aircraft launched waves of missiles at Iranian-backed Houthi rebels in Yemen early Friday in Sanaa, it capped weeks of warnings to the group to cease their drone and missile attacks against commercial vessels in the Red Sea or face severe consequences.

Previously the U.S. had withheld...