Kidnappers holding four Western peace activists hostage in Iraq have said they are giving US-led forces one final chance to free Iraqi prisoners or they would kill their hostages. In a new video shown by Aljazeera on Saturday and dated 21 January, the four hostages were shown standing against a wall in an unknown location. The four - two Canadians, one Briton and one American - appeared to be speaking to the camera but their voices could not be heard. A statement received along with the tape and read on air said the kidnappers were giving a "last chance" for US and Iraqi authorities to "release all Iraqi prisoners in return of freeing the hostages otherwise their fate will be death". Briton Norman Kember, American Tom Fox and Canadians James Loney and Harmeet Sooden were kidnapped on 26 November in Baghdad, where they were working with a Christian peace organization. They are being held by the previously unknown Swords of Truth.