The two young Scandavian tourists found murdered in Morocco may have been killed by terrorists affiliated with ISIS.

As CrimeOnline previously reported, Louisa Jespersen, 24, from Denmark, and Maren Ueland, 28, from Norway, were found brutally murdered in the North African country’s High Atlas mountain range on Monday.

A witness at the scene reportedly claimed the young women were beheaded, and that the suspects had been camping nearby.

NBC News reports that four suspects are being held in connection to the killings, which the suspects allegedly filmed. Numerous outlets have reported that a video of a violent beheading had been shared on social media.

According to NBC News, authorities are treating the murders as a terrorist attack; and Moroccan national security spokesman Boubker Sabik is reportedly looking into the possibility that some of the suspects are affiliated with extremist groups.

Both of the murdered women were students at the University of South-Eastern Norway, and had gone on an adventure for their holiday break.

“What should have been a holiday trip turned into a nightmare,” Danish Prime Minister Lars Loekke Rasmussen told Danish reporters, according to the NBC News report.

This is a developing story. CrimeOnline will provide further updates when more information is available.