"The valves before and after it were shut down, so the fire is isolated," he said.

The cause of the fire is being investigated.

An energy ministry official in Turkey said: "Whether it is sabotage or some other reason, we still don't have that information. At this point, all our efforts have focused on putting out the fire completely."

The price of Benchmark Brent crude rose by more than $1 to $118.77 a barrel due to the interruption in supply, but later the price fell again.