Saudi shares closed higher Saturday with gains in all sectors after oil prices rose Friday. The Tadawul All Share Index gained 1.37 percent to 6,084.55 points and the petrochemical sector added 2.5 percent to 6,095 points. Oil prices rose slightly Friday and have come back from a 12-month low earlier this week. Petrochemical giant Saudi Basic Industries Corp. (SABIC) added 2.6 percent. Banking stocks rose 0.5 percent, lifted by gains in heavyweight Al