OSLO, Norway (AP) — Norwegian prosecutors on Monday announced that they have indicted the eldest son of Norway’s crown princess on multiple charges including rape after a lengthy investigation. Oslo state attorney Sturla Henriksbø said Marius Borg Høiby could face up to 10 years in prison if convicted, broadcaster NRK reported.

Marius Borg Hoiby, the 28-year-old stepson of the heir to the throne, faces up to 10 years in prison if convicted. Hoiby denies all charges of sexual abuse, his attorney said.

Norway's Crown Prince Haakon said on Tuesday the royal family would continue to carry out official duties while his stepson stands trial next year accused of rape, adding that this is a challenging time for everyone involved.