The Nordic country has opened an investigation into the damage, just weeks after NATO stepped up its military presence in the area following a series of similar incidents.

Norwegian authorities have released a cargo ship with an all-Russian crew, initially suspected of damaging a Baltic Sea telecoms cable. After investigation, no connection was found between the ship and the incident.

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.