Latvia on Sunday said it had sent a warship to investigate the latest apparent act of sabotage in the Baltic, as Sweden reported at least one undersea optic fibre cable linking the two countries had been damaged.

The apparent attack comes less than a month after Nato launched a new mission in the Baltic Sea in response to repeated attacks on underwater power and telecom cables – some of which have been blamed on Russia.

Sweden has opened a preliminary investigation into suspected aggravated “sabotage” and ordered the detention of a vessel in the Baltic Sea suspected of damaging an underwater fiber optic cable connect

A subsea data cable between Latvia and Sweden was damaged early Sunday, sparking a criminal investigation, a third such incident in the Baltic Sea in the past three months.

Prosecutors in Sweden are launching a preliminary investigation into a suspected act of "serious sabotage" after a undersea cable in the Baltic Sea was discovered to have been damaged on Sunday. A ship suspected of carrying out the sabotage has been seized,