(CNN) A 14th person was arrested Saturday in connection with the beheading deaths of two Scandinavian tourists, according to the state-run Maghreb Arab Press.

Moroccan authorities took the suspect into custody in the southwestern city of Marrakech. The news agency described him as a "Swiss man who holds Spanish nationality with residence in Morocco."

On December 17, 24-year-old Louisa Jespersen of Denmark and 28-year-old Maren Ueland of Norway were found beheaded in the town of Imlil, in Morocco's Atlas Mountains.

The bodies of Maren Ueland of Norway, left, and Louisa Jespersen of Denmark were discovered in the High Atlas mountain range on December 17.

Authorities have already arrested 13 suspects connected to the killings, state-controlled news agency 2M reported. Four were suspected on killing the women, and appeared to pledge allegiance to ISIS in a video. The additional nine were arrested in several cities for their alleged connections to the murder suspects.

Morocco's Central Bureau of Judiciary Investigations (BCIJ) did not identify the latest suspect, but said he espouses extremist and violent ideology, MAP reported.

Read More