Saudi authorities have traced the source of explosives used in the recent car-bomb blasts that targeted the Interior Ministry and special forces base here to a house in a densely populated low-income suburb in the middle of Riyadh city. The Interior Ministry said when they searched the location police investigators found the back seats of the two cars used in the attacks. The seats were removed to make room for explosives. Police also recovered communication equipment, a computer, ammunitions and women's clothes as well as a number of documents, the Saudi Press Agency reported quoting an Interior Ministry statement. Meanwhile, security forces arrested a suspected militant, while another Saudi was detained on suspicion of links to a shootout in Kuwait, Interior Ministry spokesman Brig. Mansour Al-Turki said yesterday. The wanted suspect was arrested late Saturday after security forces raided his house in Baqaa.