A white Nissan Maxima was driven up to the complex at midnight, and hand grenades thrown from it at the guards; then a Toyota jeep, painted with the insignia of security forces, entered the compound and was detonated, setting off around 300 kilograms of mixed explosives. Investigations led to a rest house in the district of Al-Dar Al-Baida, to the south of Riyadh, where equipment used to paint the jeep was seized. Security authorities are tracking down others involved in the perpetration of this criminal attack.