Norwegian police seized a Russian-crewed ship on suspicion of being involved in causing “serious damage” to a fiber cable in the Baltic Sea between Latvia and Sweden.

Police say a Norwegian-owned and Russian-crewed ship that authorities suspect may have been involved in damage to an underwater fiber optic cable connecting Latvia and the Swedish island of Gotland has been stopped off Norway.

Norwegian authorities detained the Silver Dania vessel with a Russian crew on Jan. 30 on suspicion of it damaging an undersea fiber-optic cable linking Latvia and Sweden, the Norwegian police announced.

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.

The authorities said they believed the vessel may have been involved in damaging the cable, the latest act of apparent sabotage in the Baltic Sea.

Police in Norway said on Friday they had seized a Norwegian-owned ship with a Russian crew over its suspected involvement in damage done to a Baltic Sea cable.Nations around the Baltic Sea have scrambled to bolster their defences since the suspected sabotage of undersea cables in recent months,

TradeWinds already reported about the 5,353-dwt fish carrier Silver Daniel (built 1989) being held in the Norwegian port. Norway acted upon a request by Latvian authorities, which had suspected the Silver Daniel of involvement in the sabotage last week of a fibre-optic cable linking Latvia with Sweden.