The Jamestown Foundation's Terrorism Focus, 25 Mar 08:

Moqtada al-Sadr’s Religious Strategy Complicates Jaysh al-Mahdi Ceasefire
.....Without the central arbiter figure in Moqtada al-Sadr, the Jaysh al-Mahdi is likely to further fragment as deeper splits are created within the ranks. Al-Sadr’s absence leaves a power vacuum susceptible to being filled by informal players. According to an Iraqi intelligence report, Iran is one of the main beneficiaries of al-Sadr’s new religious ploy. The IRGC holds great influence within a large faction of the JaM. With al-Sadr’s temporary absence, Iran may be inclined to sway JaM commanders to opt out of the ceasefire to confront Awakening Council fighters and/or U.S. troops. As an insurance policy in gaining a greater share in JaM policy, Iran may decide to further infiltrate and seek influence over militia commanders—redefining local Shiite loyalties.

External factors have much influence on what becomes of JaM. One such variable is the Awakening movement, which has developed into a militia that arguably surpasses and threatens JaM supremacy. The rise of Awakening power has contributed to obvious splits within JaM. Targeted assassinations against Awakening members have been blamed on a growing number of splintered factions from the Shiite militia. According to intelligence corroborated by sources belonging to the Awakening councils, rogue elements of the JaM have been sponsored by the Iranian Qods Force in starting “armed activities” against Awakening members.

Another variable is the potential disintegration—rather than rise—of the Awakening councils. Awakening commanders are threatening to rejoin the Sunni insurgency and back al-Qaeda if Iraq’s central government does not integrate their fighters as part of the country’s security forces with permanent payrolls. Prime Minister Nouri al-Maliki’s government is resisting that call, claiming that the movement is largely made up of yesterday’s terrorists. An increase in the number of Sunni insurgents would compel Shiite militiamen to break away from al-Sadr, simultaneously pressuring al-Sadr to lift the ceasefire—a prospect leading back to sectarianism.....