A group purporting to be Islamic State militants have released a video in which they threaten to behead a Croatian hostage if the Egyptian government does not release "Muslim women" from jail.
The video shows a man wearing a yellow jumpsuit who is kneeled in front of a masked militant holding a knife.
The video is believed to come from Isis's Egyptian affiliate group in the Sinai Peninsula.
The man reads aloud from a note, identifying himself as 30-year-old Tomislav Salopek. He says ISIS captured him on 22 July.
He said he will be killed if Egyptian authorities do not give in to the demands within 48-hours, although it is not clear exactly who the group wants released from prison.
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Croatia's Foreign Ministry confirmed that one of its nationals had been kidnapped in Cairo last month.
Mr Salopek said he worked for CGG Ardiseis, a French oil and gas company that have an office in a Cairo suburb which are home to many expats and diplomats.
The title of the footage was “A Message to the Egyptian Government”.
Militants from the extremist group have carried out a number of beheadings in the past, releasing footage of the killings as part of its propaganda.
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