Finnish authorities have arrested two people in connection with damage to an undersea telecommunications cable in the Gulf of Finland that occurred earlier this week between the capitals of Finland and Estonia, police said Thursday.

Axar.az informs, citing Associated Press, the damage was discovered early Wednesday in Estonia’s exclusive economic zone. The cable belongs to Finnish telecommunications service provider Elisa and is considered to be critical underwater infrastructure.

Helsinki police have opened an investigation into aggravated criminal damage, attempted aggravated criminal damage and aggravated interference with telecommunications.

Officials placed two other people under travel bans as a result of the ongoing investigation, Helsinki police said in a statement Thursday.

The individuals’ connections to the ship were not immediately clear and police would not release their nationalities or other details.

The ship, named the Fitburg, was flagged in St. Vincent and the Grenadines. It had been traveling from Russia to Israel. The 14 crew members hail from Russia, Georgia, Azerbaijan and Kazakhstan and were detained by Finnish authorities.

Finnish National Police Commissioner Ilkka Koskimaki said earlier this week that the ship was dragging its anchor for hours when it was discovered in Finland’s exclusive economic zone. He noted investigators are not speculating on whether a state-level actor was behind the damage.

Finnish Customs discovered structural steel in the cargo that originated in Russia and falls under sanctions imposed by the European Union, the agency said in a statement.

“Import of such sanctioned goods into the EU is prohibited under EU sanctions regulations,” the statement said. “Finnish Customs continues to investigate the sequence of events and the applicability of EU sanctions legislation to this case.”