Marius Borg Høiby was arrested Sunday evening on new charges alleging assault, threats with a knife and violation of a restraining order, police said in a statement. They requested four weeks' detention on the grounds of risk of reoffending. His lawyers couldn't immediately be reached for comment.

Police said that the eldest son of Norway’s crown princess has been arrested just before his trial opens on charges including rape in a case that has been an embarrassment to the royal family.

Marius Borg Høiby's trial has begun in Oslo as he is accused of sexual assault and violence from several victims

The son of Norway’s crown princess has pleaded not guilty to rape charges as he goes on trial for multiple alleged offenses, opening weeks of proceedings in a case that has cast a shadow on the royal