Hunting rifles, knives and materials that could be used for bomb-making were discovered after police stormed the homes of the suspected killers.
The chilling discovery has sparked fears the attack was planned by a wider ISIS network operating across the country, which hasn't seen a terror attack on westerners since 2011.
Nine more suspects were detained yesterday after tourists Louisa Vesterager Jespersen, 24, from Denmark, and Maren Ueland, 28, of Norway, were butchered on a hiking holiday in Morocco.
The arrests took place in the capital Marrakesh, Essaouira, Sidi Bennour, Tangier and Ait Baha – with four people initially held pledging allegiance to ISIS in a video posted on social media.
Thirteen people are currently being questioned after the tourists were discovered on Monday in the Atlas Mountains with knife wounds to their necks.
The Foreign Office says terrorists are "likely" to carry out attacks in Morocco and urges visitors to be "vigilant at all times".
It writes that "attacks could be indiscriminate or target foreigners", citing the last major terror incident in April 2011.
Seventeen people were killed and 25 injured in a large explosion caused by a bomb in Marrakech at the Argana Restaurant in Djema el-Fna Square.
While Morocco is seen as relatively safe compared to its North African neighbours, around 1,800 Moroccans have become jihadist fighters in Libya, Iraq and Syria in recent years.
Pictures released yesterday have revealed the squalid house of one of the terror suspects accused of the barbaric murders on the two Scandinavian tourists.
Photos show the rundown home of Younes Ouaziad, whose family claim was "brainwashed" by ISIS.
The 26-year-old, who lived in dire conditions at his father's house in Marrakesh, had repeatedly refused to get a job – even after his wife had a miscarriage.
Hunting-obsessed Ouaziad became intensely jealous of his wife after he turned to religion, his spouse said, forbidding her from leaving the house alone.
Arrested on a bus along with three others on Sunday, dad-of-one Ouaziad lived at the property along with his wife, daughter, sister and baby.
Speaking at their home, his family and friends expressed their shock, painting a picture of a devoted family man who was workshy and vulnerable to radicalisation.
His dadsaid: "On Sunday night, police came to my house to investigate. I swear on my daughter, I was so shocked that I couldn't stand up on my legs. My wife has not left her bed since it happened.
"You can ask all the neighbours, my son was a good boy and nice to everybody. He always prayed on time and treated people well. I just don't know who brainwashed him."
His wife, who asked not to be named, said that the only problems in the marriage were thatOuaziad refused to work and was jealous of her.
She said: "We were always fighting because he refused to get a job. Also, he doesn't let me go out. I don't have the right to go out alone.
"If I want to go out, he has to be with me. Wherever I want to go, whatever I want to do, he has to be with me.
"He isn't even that religious. He is just jealous, that's it. I've never seen him being abnormally religious. He was praying the same as everybody else.
"But we have been married for four years and he's never treated me terribly. What happened shocked me. It destroyed us."
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