Isis has published a penal code listing crimes punishable by amputation, stoning and crucifixion, along with a chilling vow to ensure the code is vigilantly enforced in areas under its control.

The document, entitled: "Clarification [regarding] the hudud ( a set of fixed punishments), was published by the militant group as a reminder and warning to those living under its rule in Syria and Iraq, according to a translation by the Middle East Media Research Institute (Memri).

The document’s release was followed by an unprecedented spate of violent executions that saw a woman accused of adultery stoned to death, 17 men crucified and two men accused of homosexual acts thrown off a building within 48 hours of each other.

Isis images appear to show the execution of two men accused of being gay

Isis also released images showing the execution of eight Iraqi policemen accused of passing on information to the Iraq army, who were dressed in orange jumpsuits and shot simultaneously earlier this month.

Eight Iraqi men were shot by Isis militants

The document begins by emphasising the need for Muslims to adhere to tough Sharia codes of conduct. 'Crimes' such as homosexuality and 'spying for the unbelievers' are among those deemed punishable by death.

The document listing the penal code

The acts and their respective punishments are listed as follows:

Blasphemy against Allah: Death

Blasphemy against the Prophet Mohamed: Death – even if the accuser repents

Blasphemy against Islam: Death

Adultery: Stoning until death in case the adulterer was married and 100 lashes and exile if he or she were unmarried.

Sodomy (homosexuality): Death for the person committing the act, as well as for the one receiving it.

Theft: Cutting off the hand

Drinking alcohol: 80 lashes

Slandering: 80 lashes

Spying for the unbelievers: Death

Apostasy: Death

Banditry:

1: Murder and stealing: Death and crucifixion

2: Murder only: Death

3: Stealing (as part of banditry): Cutting off the right hand and the left leg

4: Terrorizing people: Exile

Memri adds that the document also reaffirmed its commitment to enforcing the brutal punishments listed in its penal code.

Charlie Winter, a researcher for the counter-extremism think tank Quilliam, said the document appeared to be authentic. He told The Independent it was released on 16 December from the Aleppo branch of Isis.

Isis is believed to have crucified 17 young men in the space of 48 hours at the end of last week, a monitoring group said

“It outlines a number of punishments, some of which are already incorporated into the penal code of some Arab states," he said.

"The 'hudud' punishments are derived from a literalistic interpretation of the Islamic scriptures without taking the historical context into account."

Such punishments have also been extended to members within Isis' own ranks accused of breaking the penal code. In January, a top official within Isis' self-declared police force was found beheaded, left with cigarette in mouth and 'this is evil' message written on his corpse.