The Central Office of Judicial Research in Morocco said in a statement that the three suspects had been detained in Marrakesh. Another suspect arrested on Tuesday was thought to have extremist ties, Moroccan prosecutors told local news outlets without providing further details. The names of those arrested were not immediately released.

The authorities said that the bodies of the victims, Louisa Vesterager Jespersen, 24, of Denmark and Maren Ueland, 28, of Norway, were found on Monday by other tourists in an isolated area of the High Atlas Mountains, an area popular with hikers and six miles from the village of Imlil. Both women had been studying at the same school in Norway to become tour guides.

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