Iranian drones destroyed three floors of the US Embassy in Riyadh and directly struck the CIA station in a tandem attack, the Wall Street Journal reported on 5 April. 1 The second drone entered the hole created by the first. Saudi Arabia had originally claimed "limited damage." A separate drone was believed aimed at the residence of the highest-ranking US diplomat. Had the strike occurred during working hours, hundreds typically present could have been killed.
The tandem method, a first drone to breach, a second to penetrate, shows a level of targeting precision that neither Saudi air defences nor diplomatic messaging had acknowledged. Iran received upgraded Geran-2 drones from Russia by end of March. The Riyadh strike suggests those upgrades are already operational in the field.
