A militant group in Iraq is reported to have threatened to behead a Turkish hostage unless the United States frees all Iraqi prisoners.

The Dubai-based Al Arabiya television network Monday broadcast a videotape showing three armed men surrounding the hostage who was holding up identification.

In the footage, one gunman identified the kidnappers as members of Tawhid and Jihad - a group led by wanted terrorist Abu Musab al-Zarqawi.

But news reports say the video did not feature the group's banner that had always appeared in its previous videos.