Danish student Louisa Vesterager Jespersen, 24, and 28-year-old Norwegian Maren Ueland had their throats slit while camping in an isolated area of the High Atlas mountains in December.

The main suspects, who allegedly pledged allegiance to the Islamic State (IS) group, are all from the Marrakesh region near the site of the killings, which shocked the North African country.

Abdessamad Ejjoud, a 25-year-old street vendor, is the alleged leader of the group. He had been jailed for trying to join IS in Syria but was released in 2015.

Younes Ouaziyad, a 27-year-old carpenter, and 33-year-old street vendor Rachid Afatti have also been named as key suspects.

The defendants were taken from prison to an anti-terrorism court in Sale, near Rabat, in vans escorted by police on motorcycles for the resumption of their trial, an AFP reporter said.

They face charges including promoting terrorism, forming a terrorist cell and premeditated murder.

The families of the accused did not attend the court session.

The main suspects "spontaneously admitted their crime during the investigation, and today they regret what they did," their lawyer Hafida Mekessaoui told AFP.

An opening hearing was held on May 2 but immediately postponed for two weeks after defence lawyers requested more time to prepare their case.

A Spanish-Swiss convert to Islam is among the suspects on trial, accused of teaching the main accused how to use encrypted communications and how to fire a gun.

Nature lovers Jespersen and Ueland shared an apartment and went to Norway's Bo University where they were studying to be guides.

They had travelled together to Morocco for their Christmas holidays.

Their lives were cut short in the foothills of Toubkal, the highest summit in North Africa, some 80 kilometres (50 miles) from the city of Marrakesh, a tourist magnet.

'Enemies of Allah' 

According to the charge sheet, the assailants travelled to the High Atlas mountains on December 12 on a mission to kill tourists.

Several potential targets were passed over because the foreigners were accompanied by guides or local residents.

It was four days before they selected their targets. Two of them carried out the killings while the third filmed them on a telephone, according to the prosecution.

After the bodies were discovered, the Moroccan authorities were initially cautious, referring to a "criminal act" and wounds to the victims' necks.

But that all changed when the video surfaced showing a victim being beheaded, while one of the killers refers to "enemies of Allah" says the attacks were in revenge for the killings of jihadists in Syria.

A separate video in the initial aftermath of the murders showed the alleged killers pledging allegiance to IS leader Abu Bakr al-Baghdadi.

Investigators said the "cell" was inspired by IS ideology, but Morocco's anti-terror chief insisted the accused had no contact with the jihadist group in conflict zones.

IS has never claimed responsibility for the double-murder.

Police quickly arrested a first suspect in the suburbs of Marrakesh, and three others were caught a few days later when they tried to leave the city by bus.

The suspects had recently embraced Salafism, an ultra-conservative branch of Sunni Islam, according to friends, neighbours and some family members.

A lawyer for one of the victim's families told AFP he would seek the death penalty for the murders.

A de facto suspension on executions has been in place in Morocco since 1993.

A second Swiss citizen arrested after the double-murder was tried separately and jailed in mid-April for 10 years on charges including "forming a terrorist group".

The main trial is expected to run for months before it reaches a verdict.

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