Swedish prosecutors have decided to release a vessel belonging to a Bulgarian shipping company after ruling out initial suspicions that sabotage caused damage to an undersea fiber-optic cable between Sweden and Latvia.

The Norwegian-registered ship carrying a fully Russian crew was allowed to leave the port in Tromso after “a number of investigative steps.

Norwegian authorities detained a second vessel suspected of the latest data cable breach in the Baltic Sea, following a similar move by Sweden that’s probing the incident as sabotage.

Sweden is investigating damage to a data cable linked to Latvia, the latest breach in the Baltic Sea region where European authorities are on high alert.

Damage to the cable running between the Latvian city of Ventspils and the Swedish island of Gotland was detected on January 26.