Copies of Dabiq, the terror group's official publication released online, could be bought for up to £27 and the author was listed as Al-Hayat Media Center - also the name of ISIS' media arm.

Previous issues of the magazine have justified the kidnapping and rape of slave girls and battlefield guidance to commanders, and included articles supposedly written by British hostage John Cantlie.

The listings for the paperback copies describe Dabiq as a periodical focussing on issues including "jihad" (holy war) as well as 'photo reports, current events and informative articles on matters related to the Islamic State'.

The seller was listed as CreateSpace Independent Publishing Platform, an Amazon company which allows people to create, publish and distribute books for free.

The listings were tonight removed from the website, although it is not known whether this was done by the seller or by Amazon.

The BBC reported that Dabiq was also being sold on Amazon sites in the US, France, Germany, Italy and Spain.