Houthis threaten more Saudi strikes as UN warns of humanitarian crisis in Yemen

Estimated 100,000 Yemenis displaced amid renewed fighting as Qatar sounds alarm over Bab al-Mandab strait

Saudi cities faced the threat of a second day of Houthi attacks as fighting across Yemen led the UN to warn of a humanitarian crisis with 100,000 Yemenis already displaced.

As oil prices remained well over $100 (£74) a barrel, Qatar warned of a catastrophe if the Iran-backed Houthi militants won full control of the Bab al-Mandab strait, the narrow waterway at the bottom of the Red Sea dominating the key naval route to Asia. The strait has become vital to Saudi crude oil exports as the wider Middle East war chokes the strait of Hormuz in the Gulf.