Finnish police said Friday that they concluded their investigation into an oil tanker suspected of damaging several undersea cables in the Baltic Sea, officially identifying three crew members as criminal suspects.

The Eagle S, registered in the Cook Islands and believed to be part of Russia’s so-called “shadow fleet,” allegedly dragged its anchor for dozens of kilometers across the seabed, damaging one electrical cable and four telecommunications cables on Dec. 25.

The ship’s anchor was later recovered by the Swedish navy in January.

“Based on the material collected from the vessel, the examination of the seabed and the interviews conducted with the crew, senior officers of the tanker Eagle S are suspected of aggravated criminal mischief and aggravated interference with telecommunications,” Finland’s National Bureau of Investigation said in a statement.

The suspects include the ship’s captain, chief mate and second mate.