Crown Princess Mette-Marit's Son Allegedly Threatened to Set Woman's Clothes on Fire After Attack: Reports

Crown Prince Haakon of Norway's stepson was arrested on Aug. 4

Alleged new details have emerged around the recent arrest of Crown Princess Mette-Marit of Norway's son, Marius Borg Høiby.

One week after Marius, Crown Princess Mette-Marit's 27-year-old son from before her marriage to Crown Prince Haakon, was arrested and released after a "violent incident" involving a woman at an apartment in Oslo, according to a police statement, it has been alleged that he threatened to set her clothes on fire after the attack.

"Two anonymous sources told the Norwegian magazine Se og Hor that police were in possession of an audio tape of the crown prince’s stepson telling the victim he would set fire to her clothes if she did not do what he wanted," The Times reported on Aug. 12.

The next day, Se og Hor published photos claiming to be taken from inside the apartment where the attack happened, including a knife sticking out of a wall and a light fixture shattered on the floor. (Outlets like the Daily Mail and the Daily Telegraph have also reported on the allegations.)

Related: Meet Norway's Royal Family: All About the 1,000-Year-Old Monarchy

A statement shared by the Oslo Police on Aug. 13 said that Marius, who doesn't have a royal role, was arrested on accusations of causing bodily harm on Aug. 4 after authorities received word of a "violent incident carried out in an apartment on Frogner in Oslo during the night," per an English translation.

Authorities responded to the apartment where the incident allegedly happened, received information from the victim and investigated the scene before they decided to make the arrest, it continued. The police then contacted Marius at Skagum, a royal residence outside Oslo, and the arrest happened "calmly" at Jansløkka school, where they agreed to meet. He was released the following day.

Police shared more about his alleged relationship with the woman and what's next in the Aug. 13 release.

"Høiby has a relationship with the woman who was subjected to the physical abuse. The police do not have information that the woman has suffered serious injuries, but it will be part of the investigation to map out the extent of the victim's injuries," the police statement (translated into English) said. "The charge has since been extended to cover damage to the apartment."

"Høiby has not wanted to explain himself as of now, but the police are in dialogue with the defense attorney about possible questioning," it continued. "The police will also carry out follow-up interviews with the victim. We also collect witness information and other documentation in the case."

It added that the case is being investigated by the center unit of the Oslo police district.

Se og Hør previously reported that Marius was arrested and detained for 30 hours on Aug. 4 after being accused that he had "attacked" a woman at an apartment in Oslo. The woman was reportedly hospitalized for a concussion, according to the outlet.

Related: Every Royal from Around the World at the Paris Olympic Games

Two days later, Crown Prince Haakon, 51, briefly spoke about his stepson's arrest for the first time.

"It is a serious matter when the police are involved in the way they are, but at the same time, it is not right for me to go into the details of the case," the heir to the throne told reporters, according to the Daily Express.

Crown Prince Haakon was in Paris for the Summer Olympics and added that Crown Princess Mette-Marit, 50, stayed home despite previous plans to join him in France.

"In our family, as in all families, it is sometimes important to be there. This time it was me who went while she stayed at home," Crown Prince Haakon explained, according to the outlet.

Haakon first stepped out at the global games on Aug. 6, where he watched an equestrian final and sat with Prince Albert of Monaco and Princess Alexandra of Hanover at another event. He mingled with athletes around the Olympic Village in photos shared by the Royal House of Norway on Aug. 8, before Crown Princess Mette-Marit joined him in Paris on Aug. 10, appearing the day before the closing ceremony.

Can't get enough of PEOPLE's Royals coverage? Sign up for our free Royals newsletter to get the latest updates on Kate Middleton, Meghan Markle and more!

The crown prince couple are also parents to Princess Ingrid Alexandra, 20, who follows her father in the line of succession, and Prince Sverre Magnus, 18.

For more People news, make sure to sign up for our newsletter!

Read the original article on People.