(Updates with markets in Saudi Arabia, Egypt open) DUBAI, Dec 7 (Reuters) - Petrochemicals dragged down Saudi Arabia's bourse in early trade on Sunday after oil fell further at the end of last week and Yansab an**unced plans to cut dividends and shut down a plant for maintenance. Brent crude slipped 0.8 percent to $69.07 a barrel on Friday after Saudi Arabia slashed its oil prices for Asian and U.S. buyers. The kingdom's main index edged down 0.4 percent. Shares in Saudi Basic Industries fell 0.9 percent and its subsidiary Yanbu National Petrochemical Co (Yansab) tumbled 6.7 percent. ...