SAUDI ARABIA -- Al Qaeda on Saturday vowed more attacks on Saudi oil facilities a day after a foiled attempt to bomb the world's biggest oil-processing complex showed the group still can strike inside the kingdom.

A strike on the Abqaiq complex, near Saudi Arabia's eastern Persian Gulf coast, could have been devastating. Nearly two-thirds of the country's oil flows through the facility for processing before export.

The two suicide attackers were killed when their explosives-packed cars were set off during clashes with security at the perimeter of the complex. Two guards also were killed.

The Saudi branch of Al Qaeda, which claimed the attack, warned in an Internet statement Saturday that suicide bombers will target more oil facilities. "There are more like them who are racing toward martyrdom," the posting said.

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