Riyadh says it will retaliate after overnight attacks by Iran-backed Yemen group on oil facilities wound more than 70

Yemen’s Iran-backed Houthis have attacked four cities in Saudi Arabia, wounding more than 70 people and setting oil installations ablaze in what appeared to be a significant expansion of the Middle East war.

Saudi Arabia said it would retaliate after the overnight strikes – reportedly involving dozens of drones and missiles – that targeted several oil facilities in the country’s south.