The ballistic missile attack was claimed by the Iran-backed Houthi rebels to have been aimed from a distance of 1,000km on Tuesday at a royal palace meeting in Riyadh. It missed aim and exploded outside its target. Witnesses reported a large explosion in the Saudi capital and heavy smoke. The Saudis say it was intercepted, like the previous two Houthi ballistic missiles fired into the kingdom. Riyadh later announced a Saudi air strike against Houthi targets in Yemen.