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The bodies of Louisa Vesterager Jespersen, 24, from Denmark, and Maren Ueland, 28, from Norway, were found on Monday near Imlil in the Atlas Mountains. A group of terrorists filmed themselves slitting the throats of one of the victims while branding the two women 'enemies of God' and saying their actions were 'Allah's will.' Three men were arrested this morning in a Marrakesh bus station following a 72-hour manhunt, after another person was detained on Monday.

The first suspect has been linked to an Islamic terror group, authorities confirmed. Danish intelligence said it was investigating the video which has been shared on social media and claims to show the gruesome killing of one of the tourists. The chilling clip shows a man cutting a woman’s neck with what appears to be a kitchen knife. The words "this is in revenge for our brothers in Hajin” can be heard in reference to the last ISIS stronghold in Syria which has been seized by US-backed forces.

Louisa Vesterager Jespersen and Maren Ueland were killed in Morocco

In a statement the Danish intelligence service said ISIS could be behind the horrific killings. It said: "The video and preliminary investigation according to the Moroccan authorities indicate that the killings may be related to the terrorist organisation Islamic State. "This is a case of an unusually bestial killing of two totally innocent young women.” Ms Jespersen and Ms Ueland travelled to Morocco for a month-long holiday on December 9. They were studying to become outdoor guides at a university in Norway but were taking a break in the north African country. The pair had been spotted with three men in Marrakesh before going to the mountains to hike. Hours later they were found dead from knife wounds in their tent.

Suspects in the brutal murder of the two Scandinavian women

All four arrested men are believed to be between 25-33-years-old while the three men detained later have been identified only by their initials, RA, AE and OA. Officials have said Mr RA, a salesman, is from a small village outside Marrakesh called Douar el Caid and was born in 1985 while the second suspect, AE, is a carpenter from Azzouzia, a district in the north-west of the city. The third man, OA, is from the Derb Zeroual area of Marrakesh. Eyewitnesses who saw the arrests described police boarding a bus near a market in the centre of Marrakesh where a trader had alerted authorities after seeing the men with knives. The police seized four knives which they believe were used in the attack just before the bus was due to leave to travel south. A ticket inspector on the bus, Abdulrahim, told the Daily Mail: “We came from Azilal and stopped in Marrakesh before continuing to Agadir. “We picked up three people. They bought their tickets.

Authorities investigate the bus in which the three men were arrested in Marrakesh

“When the bus left the station, a policeman asked me to close the door of the bus, because we normally leave it open for other people to jump on. “Then he told me to stop the bus in front of the Ryad Mogador hotel. “Then the police got on the bus and they went to check the guys and they found four big knives.' Meanwhile a tragic message posted by Jespersen to her Facebook friends about her trip to Morocco emerged. Last month she asked friends to get in touch with suggestions for her holiday writing: “Dear friends, I'm going to Morocco in December. Any of you guys who's around by then or any mountain friends who knows something about Mount Toubkal?” Her heartbroken ex-boyfriend paid tribute in an emotional post on Facebook, describing his “amazing Lulu” as “full of energy, a bundle of joy, caring and thoughtful.”

Maren Ueland (left) and Louisa Vesterager Jespersen (right)

Investigators are pictured near a tent at the scene of the murders in the Atlas Mountains

The pair had split up earlier in the summer but remained “best friends” and added he was lucky to have been her boyfriend for two years. He said: “You have a special place in my heart and it is reserved for you the rest of my hopefully long life. “To make room for you in my heart, I also had to give you a part of mine. “A part of me died Monday morning, but it also means that part of me is with you wherever you are now. “No matter how lonely you are, I'll be there with your side and you with mine.

Norwegian Prime Minister Erna Solberg has condemned the "brutal and meaningless attack"

Danish Prime Minister Lars Løkke Rasmussen said the killings were a terrorist act