Finnish authorities on Monday released a vessel seized on suspicion of damaging an undersea cable linking Helsinki and Estonia's capital Tallinn on December 31, though one crew member remains in custody, police said.
Three other crew members remain subject to a travel ban as Finnish authorities continue their investigation.
The Fitburg, a 132-metre-long (433-foot-long) cargo ship en route from St Petersburg, Russia, to Haifa, Israel, was detained by Finnish authorities on New Year's Eve following suspicion that the ship's anchor had damaged the telecoms cable in the Gulf of Finland.
"The Finnish and Estonian police have completed their work on board the vessel, and the seizure can therefore be lifted," the head of the investigation, Risto Lohi of the National Bureau of Investigation, said in a statement.
Under the Border Guard's supervision, the Fitburg on Monday set sail from the Kantvik harbour in Kirkkonummi, some 35 kilometres (22 miles) west of Helsinki, around 11:00 am local time (0900 GMT), police said.
Finnish authorities are investigating the incident as "aggravated criminal damage, attempted aggravated criminal damage, and aggravated interference with telecommunications".
The vessel, flagged from St Vincent and the Grenadines, is believed to have dragged its anchor along the seabed for at least several tens of kilometres, according to Finnish authorities.
Of the vessel's 14 crew members from Russia, Georgia, Azerbaijan and Kazakhstan, one Azerbaijani national remains in custody, while three others are under a travel ban.
Finnish customs last week determined that the cargo of steel products was subject to sanctions against Russia, but no criminal investigation was launched as the products were only brought into Finnish territorial waters when Finnish authorities ordered the ship to move.
Meanwhile, an inspection conducted by the Finnish Transport and Communications Agency did not find any severe deficiencies with the ship.
Finnish telecoms group Elisa owns the cable, which is located in Estonia's exclusive economic zone.
Since Russia's full-scale invasion of Ukraine in February 2022, many experts and political leaders have viewed the suspected cable sabotage as part of a "hybrid war" carried out by Russia against Western countries.