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The Nord Stream 2 operator said it expected that other four countries along the route of the undersea gas pipeline - Russia, Finland, Sweden and Denmark - will issue permits in the coming months.
The "scheduled construction works are to be implemented in 2018 as planned" it added.
Germany's maritime authority BSH said in a statement on Tuesday that it had approved the building of the 31-kilometre section that runs through its waters since it posed no danger to shipping or the environment."