Finnish police said on Sunday they had found tracks that drag on for dozens of kilometres along the bottom of the Baltic Sea where a tanker carrying Russian oil is suspected of breaking a power line and four telecoms cables with its anchor.
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The Cook Islands-registered Eagle S was boarded by Finnish police and coastguard officials on Thursday and sailed into Finnish waters where the crew of the impounded tanker is being questioned.
Baltic Sea nations have been on high alert after a string of outages of power cables, telecom links and gas pipelines since Russia invaded Ukraine in 2022. Nato said on Friday it would boost its presence in the region.
A break in the 658 megawatt (MW) Estlink 2 power cable between Finland and Estonia took place at midday on Wednesday, leaving only the 358 MW Estlink 1 linking the two countries, grid operators said.
They said Estlink 2 might not be back in service before August.
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Finnish police suspect the Eagle S caused the damage by dragging its anchor along the seabed.