An unknown Iraqi group issued a video showing four Western hostages, calling them "spies of occupying forces", Al Jazeera television reported on Tuesday.
The video from the group calling itself Swords of Truth showed four men sitting on the ground. The name of Norman Kember, could be read on a British passport shown in the video.
The Briton was among four aid workers - including two Canadians and an American - who were snatched in Baghdad on Saturday.
Al Jazeera did not say if the tape included a threat against the men's lives. It said the group accused the men of being "spies working for the occupying forces" while working for a Christian group.
The four hostages were working for peace and humanitarian group Christian Peacemaker Teams, one of the few remaining aid groups operating in Iraq.