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 connecting Latvia and the Swedish island of Gotland earlier that day.

In a troubling incident, an important undersea data cable connecting Sweden and Latvia was found damaged in the Baltic Sea. This disruption has raised alarms, prompting Swedish authorities to start a criminal investigation into the matter.

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.