The oil price of the Organization of the Petroleum Exporting Countries (OPEC) climbed to $84.36 at the start of the week, the group said Tuesday, as uncertainty over the oil spill on the US Gulf coast drove up global markets. The cartel's basket price of crude oil brands pumped in the Middle East, Africa and South America inched up $0.23 per barrel (159 liters) on Monday, according to a report of the German Press Agency "DPA". In the worst case, the oil spill "could have severe consequences for the US domestic product supply and prices," analysts at JBC energy in Vienna said, as 42 per cent of the country's refining capacity is located in the Gulf coast region.