LONDON- Operations at Saudi Arabia's SASREF and PetroRabigh oil and petrochemical refineries have been slashed by up to 40%, two trading sources said, citing oil research firm IIR.

An attack on Saudi Arabian oil facilities at the weekend halved the kingdom's production.

(Reporting by Ahmad Ghaddar and Ron Bousso; Editing by Angus MacSwan) ((Ahmad.Ghaddar@thomsonreuters.com; +442075424435; Reuters Messaging: ahmad.ghaddar.thomsonreuters.com@reuters.net))