Telegraph.co.uk: Isil uses advertising hoardings to crucify 'spies' in its new Libyan 'caliphate'

The crucifixions are part of a raft of grisly punishments enforced by Isil since it seized power in Sirte a year ago, pushing out Libyan security forces from the neighbouring city of Misrata after a series of fierce battles last summer.

With the West now preparing to back Libya's government in a battle to retake the city, fighters from Misrata have begun to venture undercover into Sirte intelligence gathering missions.

 Zaafran roundabout in Sirte – the place chosen by the Islamic state for executions pic.twitter.com/SIJUJcNyWB— Daniele Raineri (_at_DanieleRaineri) August 25, 2015

Such undercover forays help build a ground-level picture in a way that overhead drones and spy satellites never can. But as one fighter explained to The Telegraph during a recent visit to Misrata, it carries a high risk of getting caught.

"Three of our men have been already caught and killed, and two more are missing," said "Osama", 23, who took part in the uprising against Colonel Gaddafi five years ago. "We don't know what has happened to them both."

Twelve hours after he spoke to The Telegraph, he found out. A phone call came from another of his network of informants that one of his two missing men, 37-year-old Milad Aburgeeba, had become the latest victim to go on display at the roundabout. "They got your boy and crucified him," the caller said.

Contrary to popular perception, crucifixion as practiced by Isil does not mean nailing hands and feet into a cross and leaving the victim to die. Instead, the victim is usually killed beforehand, and then left for several days afterwards, rather like the gibbets that were used in medieval Britain.

Mr Aburgeeba spent two days strung up on the gantry, his hands and feet hung up by plastic cords. In mimicry of inmates of Guantanamo Bay, he was clad in an orange jumpsuit, while a message was taped to his body with the words "spy".

An Isil flag painted on the front of the Ougadougou conference centre in Sirte, Libya  Photo: Sam Tarling/The Telegraph

Judging from pictures of the incident, which Osama forwarded to the Telegraph via mobile phone, but which are too graphic to publish - his face was apparently disfigured from torture.

Isil is now believed to have an army of nearly 3,000 fighters in Sirte, some of them senior figures from its core leadership in Iraq and Syria, others footsoldiers from sub-Saharan Africa lured partly by the prospect of decent pay.

America and Britain are now trying to persuade Libya's new unity government - formed last month after more than a year of infighting - to accept help in the fight against Isil before it starts using Libya as a launch pad to attack Europe.

The package on offer includes 1,000 British troops and 5,000 Italian troops as part of a training mission, along with promises of air support and logistical help.

While British and American special forces are believed to be in the area gathering intelligence on the situation in Sirte, they will rely in part on local Libyan informants - something that Isil's own intelligence network is all too aware of.

The group has already issued at least two previous videos showing "spies" being crucified for allegedly gathering information on Isil military positions.

In one video, a man in an orange jumpsuit was strung up in the crucifixion position alive first, and then shot dead.

Other cases have featured three brothers accused of eating during fasting time in the holy month of Ramadan, and a group of men who were accused of encouraging an anti-Isil uprising in August.

"It is a horrific thing to do," Osama added. "This is the price our fighters pay for getting intelligence to defeat Isil."