Little bird in Riyadh tells me that they first hit the main gate at Jadawel Compound by ramming them, then procedded to shoot the unarmed guards. After breaching the main gate they procedded to the closest housing (compound workers accomidations) and shot at the people inside while others drove a bomb laden vehicle inside the compound before setting it off. Jadawel is/was one of the most expensive compounds in Riyadh to live in. Home to very high-ups in the expat community.