On May 2, 2004 in an incident known as Black Saturday, a group of at least four militants in the Saudi Arabian city of Yanbu' al Bahr used security passes to access a local petrochemical plant. Once on the grounds of the facility, they stormed the offices of ABB Lummus and in the ensuing struggle killed six people, of which five were foreign workers and one was a Saudi national guard soldier, and injuring around nineteen others.
The Saudi group Al Qaeda may have been involved in the attack but Crown Prince Abdullah, leader of the national guard disputes these claims.
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