Iraq’s Shiite militias have abducted and killed scores of Sunni civilians with the tacit support of the government in retaliation for Islamic State group attacks, Amnesty International said Tuesday, as a suicide car bombing claimed by the Sunni extremists killed 23 people, including a Shiite lawmaker.

The Shiite militiamen number in the tens of thousands and wear military uniforms but operate outside any legal framework and without any official oversight, the London-based watchdog said, adding that they are not prosecuted for the crimes.

The accusations were based on interviews with relatives of victims and survivors who claimed that members of four prominent Iraqi Shiite militias – Asaib Ahl al-Haq, the Badr Brigades, the Mahdi Army, and Ketaeb Hizbollah – were behind many abductions and killings of Sunnis in the country, the rights group said in a 28-page report, entitled “Absolute Impunity: Militia Rule in Iraq.” […]