Fire shuts key US pipeline causing oil prices to surge more than 4 percent higher but falls as fire is extinguished and pipelines reopen. MOREINFO: * Oil falls after fire extinguished at pipeline * BoE calls for flexible exchange rates * German banks agree to sell IKB * German jobless number less than expected * European shares flat on jittery banking investors SCRIPT: Oil fell back after prices surged more than $4 a barrel after an explosion crippled the main pipeline supplying Canadian crude to U.S. Midwest refineries - forcing operator Enbridge to halt nearly a fifth of U.S. imports. Two employees were killed in the blast. Prices eased back after the fire was put out and two of the four pipelines affected restarted. /// Meanwhile, it is inflexible exchange rates that are holding back the rebalancing of the global economy says the Bank of England. With the euro hitting record high levels last week, European politicians are complaining that their export industries are at...