Houthi rebels in Yemen fired a ballistic missile into Saudi Arabia. The missile was believed to be a Burqan-2, a variant of the Scud. It was launched from Yemen, traveling approximately 600 miles and landing in Riyadh, the Saudi capital. Part of the missile, possibly the warhead, hit near a runway at King Khalid International Airport. The Saudi government claims that it shot down the missile with the U.S.-supplied Patriot missile defense system, although the evidence suggests that the interceptors failed to stop the missile. Iran is suspected of supplying the Houthis with the Burqan-2, a charge which Tehran denies.