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Profile: Muqtada al-Sadr
Al Jazeera's Owen Fay said al-Sadr's latest threat might be a bluff - bluster from an increasingly isolated cleric who suffered a setback in Basra last month and is now losing support from his key backers in Iran.
But the Iraqi government cannot afford to treat the threat lightly as al-Sadr still commands thousands of fiercely loyal fighters who will not hesitate to take up arms should he demand it.
If he does carry out his latest threat, political progress in Iraq will suffer a significant setback and an end to the ceasefire will yield very bloody results, our correspondent said.
"This is the governments last chance to correct the current situation"
Sheikh Salah al-Obaidi,al-Sadr spokesman