Saudi Arabia has opened emergency talks with European refinery groups after world oil prices surged to the $120 a barrel mark. The Saudis and their partners in the Opec oil producers cartel said any shortfall in oil supply caused by instability in Libya would be made up. An engineer with the Sirte oil company said a blockade by rebels had prevented 80,000 barrels a day being exported from the Dregga field alone. The massive reduction in Libya's oil output caused prices to leap.