The Stockholm prosecutor's office announced on Sunday evening the launch of an investigation into possible sabotage in the Baltic Sea, involving the seizure of a ship suspected of damaging an underwater cable between Sweden and Latvia.

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.

Swedish authorities have seized a ship suspected of damaging a data cable running under the Baltic Sea to Latvia. The Vezhen - a Maltese-flagged ship - is now anchored outside the Swedish port of Karlskrona.