Warsaw - (AFP) - The Polish company Bern, which operates the Druzhba oil pipeline linking Russia with Germany, announced Saturday that it had addressed the problem of the leakage that caused the closure of part of the line.

"Bern Technical Services on Saturday restored full functionality to the damaged pipeline supplying the company's German customers with crude oil," the company said in a statement.

"An investigation is underway to find out the cause of the leak," she added.

The company had said earlier that preliminary examinations indicated that the leak could be accidental.

The accident came after four leaks that damaged the Nord Stream gas pipelines that stretch under the sea and link Russia with Germany.
The leak was detected in a section of one of two underground Druzhba pipelines late Tuesday near the village of Zorawec in central Poland.
The pipeline provides supplies mainly to the Schwytt and Leona refineries in Germany.
Work on the Drogba pipeline, whose name means "friendship", began in the early 1990s and today extends over a 5,500-kilometre network. It transports oil from the Urals to Europe, via a northern branch through Poland and a southern one through Ukraine.