The murder of the monks of Tibhirine, a 22-year-old mystery

The seven French monks among 19 Catholics murdered in Algeria in the 1990s, and being beatified Saturday, were killed in murky circumstances with damning claims years afterwards casting doubt on the official version.

Only the heads of the men, aged between 45 and 82, were ever found after their kidnapping, which came as Algeria was deep in the 1991-2002 civil war between government forces and Islamists that left up to 200,000 people dead.

The tragedy inspired the 2010 French film “Des Hommes et des Dieux” ( “Of Gods and Men “), which won the Cannes film festival’s Grand Prix that year.

Here is an overview of the mystery of the murdered monks of Tibhirine.

- Kidnapped from a monastery - The Trappist monks lived at the Notre Dame de l’atlas monastery in Tibhirine, about 80 kilometres (50 miles) southwest of Algiers, outside the t own of Medea.

On the night of March 26 to 27, 1996, a group of gunmen stormed the monastery and kidnapped the seven Frenchmen.

A month later the Armed Islamic Group of Algeria (GIA), one of the main insurgent groups at war with the secular government, claimed responsibility.

GIA chief Djamel Zitouni said they could be exchanged for jailed insurgents.

But on May 23 the GIA announced it had slit the monks’ throats two days earlier, blaming the French government’s refusal to negotiate.

The Algerian army said it found their heads on May 30 on a road near Medea. The bodies were never seen again.

- Questions surface - The Algerian government maintained that the massacre was another Islamist crime.

However doubts were raised after allegations that the army itself may have been responsible, either through a blunder or to discredit the Islamists.

In July 2002 a former Algerian soldier, Abderrahmane Chouchane, said that Zitouni had also been a military agent while running the GIA.

Then in December 2002 an ex-member of the Algerian secret services, Abdelkader Tigha, claimed in the French daily Liberation that the military had ordered the abductions using the services of Zitouni’s group.

“Annoyed by the obstinate presence of the Trappist monks in a strategic area ... and anxious to secure France’s support for its anti-terrorist campaign,” the military decided to kidnap them, Tigha alleged from prison.

In 2004 Paris prosecutors opened a formal inquiry.

French general Francois Buchwalter, the military attache to Algiers in 1996, told the investigation in 2009 that he had learned that the Algerian military killed the men in error.

Buchwalter said an Algerian soldier whose brother took part had told him that military helicopters had opened fire on a militant camp, realising afterwards that they had also killed the monks.

The general said the monks’ heads were removed afterwards to make it look like the work of jihadist rebels. He accused the French authorities of abetting a cover-up.

- Skulls exhumed - In 2014, three years after a formal request, Algeria agreed the skulls, buried at the monastery, could be exhumed for examination in the presence of French magistrates and experts.

It however blocked the French team from taking the samples back to Paris.

In 2015 the investigators released a report that heaped doubts on the official version by concluding the monks were likely killed several weeks before the date claimed by the GIA.

Skulls exhumed - In 2014, three years after a formal request, Algeria agreed the skulls, buried at the monastery, could be exhumed for examination in the presence of French magistrates and experts