Morocco adjourned on Thursday the trial of two dozen suspects charged in the murder of two Scandinavian hikers. A total of 24 defendants -- one of whom shot a smile at journalists -- appeared in the criminal court in Sale to face charges including promoting terrorism, forming a terrorist cell and premeditated murder. The opening hearing was immediately postponed until May 16 after defense lawyers requested more time to examine the case. Danish student Louisa Vesterager Jespersen, 24, and 28-year-old Norwegian Maren Ueland had their throats slit before they were beheaded in December at an isolated site in the High Atlas Mountains. The killings shocked the North African country and three main defendants accused of direct involvement, who allegedly pledged allegiance to the ISIS group, could face the death penalty. A Spanish-Swiss national is among the suspects. Nature lovers, the two friends shared an apartment and went to Norways Bo University where they were studying to be guides. They had traveled 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 kilometers (50 miles) from the city of Marrakesh, a tourist magnet. Police quickly arrested a first suspect in the suburbs of Marrakesh, and three others were arrested a few days later when they tried to leave the city by bus. Aged from 25 to 33, all had struggled to get by in poor districts of Marrakesh. They made a living from "small jobs" and were educated to a "very low" level, according to investigators. They had recently become radicalized, according to friends, neighbors and some family members. The "terrorist cell" was inspired by ISIS ideology, according to investigators. But Moroccos anti-terror chief has said the accused had no contact with the group in conflict zones. And ISIS has never claimed responsibility for the double-murder. Abdessamad Ejjoud, a 25-year-old street vendor referred to as the emir of the group by peers, is the suspected ringleader of the operational cell and a wider group he formed in Marrakesh, according to investigators. Twenty others are due to face justice in Sale for links to the alleged killers. Among them is Kevin Zoller Guervos, a Spanish-Swiss citizen living in Morocco. Authorities allege he subscribes to "extremist ideology". He stands accused of teaching the main suspects how to use encrypted communications and how to fire a gun, according to investigators. Suspected of being a recruiter, he denied all charges when brought in front of an anti-terror judge. Another Swiss citizen arrested after the double-murder was tried separately and sentenced in mid-April to 10 years in prison for "forming a terrorist group" and for his links to another extremist network.