The Americans were abducted in Dora, a mixed neighborhood that is home to both Shiites and Sunnis, on Saturday. It was the latest in a series of brazen high-profile kidnappings undermining confidence in the Iraqi government's ability to control state-sanctioned Shiite militias that have grown in strength as Iraqi security forces battle the Islamic State group.
Two Shiite militias Asaib Ahl al-Haq and Saraya al-Salam were likely behind the attack, the Iraqi and Western official told The Associated Press today.
Both officials spoke on condition of anonymity because they were not authorized to talk to reporters.
The US Embassy in Baghdad has confirmed that several Americans are missing and said they are working with Iraqi authorities to locate them.
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Baghdad authorities said the three Americans were kidnapped from a "suspicious apartment" without elaborating, and have provided no other details. There has been no claim of responsibility.
However, another Iraqi intelligence official told the AP this week that from the Dora neighborhood the Americans were taken to Sadr City, a vast and densely populated Shiite district to the east, and there "all communication ceased."
Following the dramatic collapse of the Iraqi security forces in the summer of 2014, Shiite militias filled the vacuum, growing more powerful militarily than the country's own security forces. In addition to being some of the most effective anti-IS forces on the ground in Iraq, Shiite militias also run security in many Baghdad neighborhoods.
But many trace their roots to the armed groups that battled US troops after the 2003 invasion and kidnapped and killed Sunnis at the height of Iraq's sectarian bloodletting in 2006 and 2007. In the fight against IS, human rights groups have accused them of abuses targeting Sunni civilians, charges denied by militia leaders.
Asaib Ahl al-Haq, Iranian-backed and one of the most powerful Shiite militias operating in Iraq, has repeatedly spoken out against the presence of US forces in Iraq in the fight against IS. Saraya al-Salam is run by Iraq's influential Shiite cleric Muqtada al-Sadr whose Mahdi militia often battled with US forces between 2003 and 2011.