The cargo ship Vezhen did damage a subsea cable linking Sweden and Latvia last month but it was an accident, not sabotage, a Swedish prosecutor said on Monday, adding that the Maltese-flagged vessel had been released.

Sweden has released a vessel suspected of causing damage to an undersea fibre optic cable between Latvia and Sweden on Jan. 26, the Nordic country's prosecution authority said on Monday, adding that it ruled out sabotage.

Norwegian police said on Friday they had seized and boarded a Norwegian ship with an all-Russian crew on suspicion of involvement in causing damage to a telecoms cable in the Baltic Sea, the second vessel to be named by investigators in the case.

A ship with a Russian crew that was briefly held on suspicion of being involved in cable damage in the Baltic Sea has been released by the Norwegian authorities. Police in the northern Norwegian city of Tromsø announced on Friday that there was no evidence that the Silver Dania ship had anything to do with the recent damage to a fibre optic cable between Latvia and Sweden.

In just three months, three incidents of damage to Baltic Sea underwater cables have taken place. While accidential cable slices are common, the cluster raises suspicion.