A video apparently showing three foreign election workers kidnapped in Afghanistan (search) was shown Sunday on Arab television.

The video was the firmest evidence yet that the three are in the hands of a Taliban (search) splinter group which has threatened to kill them unless Britain troops leave Afghanistan and the United States frees Afghan prisoners.

The footage on Al-Jazeera television showed the three hostages, two women and one man, sitting hunched against a wall in a room in an undisclosed location. A militant wearing a checkered scarf around his face was also shown.

The three appeared well, if nervous, on the brief extract shown early Sunday afternoon.