Baghdad, Iraq ? Kidnappers extended a deadline until Saturday in their threat to kill four captive peace activists and posted a video of two of the hostages wearing robes and shackled with chains.

The original deadline set by the group calling itself the Swords of Righteousness was today. The extension was announced in a statement that accompanied Wednesday’s video, according to Al-Jazeera and IntelCenter, a government contractor that does support work for the U.S. intelligence community.

Norman Kember, 74, of London, Tom Fox, 54, of Clear Brook, Va., and the Canadians James Loney, 41, and Harmeet Singh Sooden, 32, were taken hostage in Baghdad two weeks ago.

They were working for the Christian Peacemaker Teams, an anti-war group, and are among seven Westerners who have been abducted in Iraq since Nov. 25. The other hostages are an American, a German and a Frenchman.