The Yemeni group seizes UN Human Rights Office in the capital Sanaa as it extends a crackdown on foreign organisations.
Houthis say ship in Gulf of Aden struck by ballistic missiles in first attack since Israeli strike on Hodeidah port.
Hans Grundberg says recent developments suggest ‘threat against international shipping is increasing in scope’.
The Houthis have endured a half-year of American strikes, delivering US President Biden a major foreign policy defeat.