A Tallink Silja cruise ferry. Picture: Tony Öhberg for Finland Today

A dead woman was found from Tallink Silja Baltic Princess cruise ferry during a cabin cleaning on Monday evening.

According to the police, the woman was Finnish and in her 30s.

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“The investigations have just begun. At the moment, we are investigating if the person has died of natural causes or if there is a crime involved. We should find out today,” said Detective Inspector Jussi Helesvirta, the investigator in charge.

The woman was returning from Stockholm to Turku, southwestern Finland, when she was found dead from the cabin during the cleaning in Turku.

The ferry arrived in Turku at 19:15 and was supposed to depart back to Stockholm at 20:15.

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According to the police, the woman found dead was traveling with a man. He is now in police custody.

“We are investigating whether he is somehow involved in the case,” said Helesvirta.

A Swedish passenger, who was waiting for the departure from Turku to Stockholm, told Finnish tabloid Ilta-Sanomat that they were informed that “the boat will depart late of schedule because of a medical emergency.” The passengers were not told about a dead passenger.

The Swedish man said that he considered the delay “weird” because “during a medical emergency the person would just be taken away from the ship so that the boat could depart.”

“At first, I was curious. Could it be the captain or, perhaps, someone is giving birth on the ship?” the man said.

When he saw the body bag carried by the police, he became aware of the true nature of the delay.

According to him, at least 10 to 15 passengers saw the body bag and according to his assessment, people were not terribly shocked.