A power struggle within Iraq’s Shi’ite Muslim majority has intensified as attempts to form a new government flounder, threatening to turn violent and ruin U.S.-led efforts to defeat Islamic State.

For the first time since the U.S. withdrawal at the end of 2011, Shi’ite factions came close to taking arms against each another last month, when followers of powerful cleric Moqtada al-Sadr stormed the parliament in Baghdad’s Green Zone.

Rival Shi’ite militiamen took up positions nearby, raising the specter of intra-Shi’ite fighting similar to events in the southern city of Basra in 2008, in which hundreds of people were killed.

Trucks carrying those militiamen, armed with rocket-propelled grenades and machine guns, patrolled the capital in clear view of the security forces, video published on the website of Iranian-backed group Saraya al-Khorasani showed.

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Image courtesy of Reuters