Nineteen people have been arrested in the wake of the murder of two Scandinavian women last week in Morocco's Atlas Mountains, a security source familiar with the case says.
They include the four main suspects in the crime and fifteen other people accused of having connections to the alleged killers, the source told Reuters, without giving further details.
Louisa Vesterager Jespersen, 24, from Denmark, and Maren Ueland, 28, from Norway were found dead early on December 17 near the village of Imlil en route to Toubkal, North Africa's highest peak and a popular hiking and trekking destination.
The four main suspects, aged between 25 and 30 years, had pledged allegiance to Islamic State in a video made three days before the bodies were found, but without agreeing to this in advance with any foreign group, police and domestic intelligence spokesman Boubker Sabik said.
He described the four men as "lone wolves," adding that "the crime was not coordinated with Islamic State".
Electronic devices, an unauthorised hunting rifle, knives and materials that could be used for bomb-making were found during police raids.