Yemen’s Shiite rebels said on Monday they have “successfully” fired a ballistic missile at Riyadh for the first time, vowing more attacks on the Saudi capital.

There was no immediate comment from the kingdom but the claim came exactly a week after Saudi Arabia said a “suicide gunboat” belonging to Yemen’s Iran-backed Houthi rebels rammed into one of its frigates in the Red Sea, killing two crew members.

Saudi Arabia has been leading a mostly Gulf Arab coalition against the Houthis since March 2015, seeking to restore Yemen’s internationally-recognized government, which the Houthis had forced to flee from the capital, Sanaa. Saudis see the Houthis as a proxy of the Shiite power Iran, the Sunni kingdom’s key regional rival. […]