Baghdad, The prices of Basra Heavy and Medium crude oil decreased slightly on Tuesday, despite the rise in global oil prices. Prices for Basra Heavy crude fell by 46 cents to reach $83.01, and prices for Basra Medium crude fell by 46 cents to reach $86.41. Global oil prices rose, supported by indications of improving demand and escalating tension in the Middle East, which sparked the rise of US futures contracts to the highest level in five months in the previous session. Source: National Iraqi News Agency