Islamists are suspected to have carried out the murder of two young Scandinavian women trekking in southern Morocco, one of whom was beheaded, a source close to the probe said.
"Radical Islam is not ruled out due to the profile of the suspect arrested and of the three men wanted" after the women's bodies were found Monday in the High Atlas Mountains, the source said, asking not to be named.
The source told AFP that one of the women 24-year-old Louisa Vesterager Jespersen from Denmark and 28-year-old Maren Ueland from Norway had been beheaded.
Police spokesman Boubker Sabik also said terrorism was suspected and that the three suspects on the run had been "identified and a search for them is under way by all the security services".
One of the three had "a court record linked to terrorist acts", he said, while the prosecutor general's office said the man in custody belonged to an extremist group.
The prosecutor general's office, in a statement, said it was determining the authenticity of a video on social media allegedly showing the murder of one of the women.
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The interior ministry said initially that the Danish and Norwegian hikers were found with cuts to their necks in an isolated mountainous area 10 kilometres (six miles) from the tourist village of Imlil.
The arrest was made in Marrakesh, about 60 kilometres north of Imlil, the ministry said. The Danish victim, Jespersen, "had her throat cut," her mother Helle Petersen was quoted by the Danish newspaper B.T. as saying.
Her family had warned her against going to Morocco "because of the chaotic situation," she added.
A local guide who works in the area told AFP the body of one woman was found inside a tent and the other outside of it.
The guide, who declined to be identified, said the area where they were found was also frequented by three men from Marrakesh, including the one who was arrested.
The two women studied at a university in southern Norway and had planned to travel together for a month, Ueland's mother told Norwegian broadcaster NRK.