The Saudi Interior Ministry said on Tuesday that four of the five militants killed on Monday were on the list of the kingdom's most wanted militants linked to the al- Qaida terror network.
Two of the killed were involved in a failed bombing attack on an oil facility in an eastern province last week, the ministry said in a statement, adding that an al-Qaida leader in Saudi Arabia was also among the killed.
The five were killed by Saudi security forces early Monday in clashes in eastern Riyadh.
Saudi security forces foiled two attempted car bomb attacks against Baqiq oil refinery on Jan. 24. Two attackers were killed in the explosion.
Baqiq, a huge oil processing center some 70 km southwest of Dammam, a port city in northeastern Saudi Arabia on the Gulf coast, manages two-thirds of the kingdom's oil output.
Saudi Arabia, the world's top crude exporter with a daily output of about 9.5 million barrels, has been battling a wave of al-Qaida linked attacks since 2003.