Saudi Arabia said it intercepted a ballistic missile over its capital, Riyadh on Wednesday. It was the fourth time in five months missiles have flown over Riyadh. Reuters said the three blasts also occurred in the capital. The attack was believed to be retaliation by Yemen’s Houthis for air raids carried out by the Saudi-led coalition. Saudi Arabia and a coalition of mostly Gulf Arab states intervened in Yemen’s civil war in 2015 to try and push back the Houthis after the movement drove the internationally recognized government into Saudi exile. The coalition has launched thousands of air strikes in Yemen which have hit schools, markets and hospitals, killing hundreds of people – though it says it does not target civilians.