Finnish police said on Thursday they are investigating whether a foreign ship was involved in the damage of an undersea power cable connecting Finland and Estonia following a sudden outage on Wednesday.

Finland’s prime minister says authorities are investigating an interruption in a power cable under the Baltic Sea between his country and Estonia.

Finnish police intend to transport the Eagle S, a Russia-linked tanker the authorities seized after suspecting it of intentionally damaging a Baltic Sea power cable, to shore. The tanker is to be moved from the Gulf of Finland to an anchorage near the Finnish port of Kilpilahti to facilitate the investigation,