Moody's downgrades Saudi Arabia credit rating over oil price slump

``Saudi Arabia's credit rating has been downgraded by Moody's because of the long and deep slump in oil prices. Moody's Investors Service said it also downgraded Gulf oil producers Bahrain and Oman... Moody's cut [Saudi's] long-term issuer rating one notch to A1 from Aa3 after a review that began in March.''