Oil Prices Rise to Highest Levels in Three Weeks Singapore, 26 Mar (ONA) —- Oil prices rose slightly today due to concerns over supply, as the US is stepping up efforts to limit Venezuelan oil exports, while a bigger-than-expected drop in US inventories helped support prices. Brent crude futures gained 20 cents, or 0.3%, to $73.22. US West Texas Intermediate crude futures rose 20 cents, or 0.3%, to $69.20 a barrel. Both crude benchmarks reached ...