A group claiming to be affiliated with the Islamic State group has released a video in which it threatens to behead a Croatian hostage if the Egyptian government does not release Muslim women from jail.
The video, showing a man in a yellow jumpsuit kneeling in front of a masked militant who is holding a knife, is believed to come from the Islamic State'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 IS captured him July 22.
He says he will be killed if Egyptian authorities do not give in to the demands within 48 hours, although it is not clear whom the group wants released from prison.
Croatia's Foreign Ministry confirmed that one of its nationals was kidnapped in Cairo last month.
Salopek says he worked for CGG Ardiseis, a French oil-and-gas company that has an office in Cairo.