The Islamic State (Isis) has put two hostages--a Norwegian and a Chinese--on "sale" in the latest edition of its online propaganda magazine Dabiq.

The Sunni terrorist group, which has in the past beheaded dozens of hostages, identifies the hostages in the "for sale" ad as Fan Jinghui (50), a freelance consultant from Beijing and Ole Johan Grimsgaard-Ofstad (48) from Oslo.

The advertisement seeking a ransom also lists out the dates of birth, residential addresses, occupations and qualifications of the captives, shown dressed in yellow jumpsuits.

The ransom ad, however, does not reveal when and how the two were captured by the Isis. It is understood that the two are currently being held hostage somewhere in Syria.

The advertisement, which is listed almost at the end of the 66-page magazine has also put up a telegram number for "whoever would like to pay the ransom for [their] release and transfer".

The ransom demand from Isis notes that "crusaders, pagans and their allies" as well as "human rights organisations" can pay for the release of the hostages as "they were abandoned by their governments" who did not do their "utmost" to buy their freedom.

The Isis also claims that the "sale" was for "a limited time offer", which is a veiled threat that they might be executed like many other hostages.