IS claimed responsibility for the attack in a statement posted by its Aamaq news agency. The statement said IS fighters had struck the 9th Battalion of the Popular Mobilization Forces, "killing its commander and 13 soldiers."
The statement also said that IS fighters blew up the battalion's headquarters and other nearby positions and destroyed two Humvees that had arrived to assist the battalion.
The intelligence official spoke on condition of anonymity as he was not authorized to brief reporters.
Also today, a police officer and medical sources said the death toll from a car bomb attack in a southern Baghdad neighborhood has reached 59 with 66 others injured.
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Authorities initially said yesterday's night attack at an auto dealership in the al-Bayaa neighborhood killed at least 55 and wounded more than 60. The Islamic State group claimed credit for the bombing.
The police officer and medical personnel spoke on condition of anonymity because they were not authorized to brief reporters.
IS, in a statement early today, said its fighters detonated bombs in a parked car among a gathering of Shiites in the Fifth Police district yesterday. It did not give further details.
The spiritual leader of Iraq's Shiites Grand Ayatollah Ali al-Sistani, expressed his condolences for the victims' families and called on those "responsible for decision-making to recognize their responsibility to preserve security."
His comments were delivered at Friday prayers by his representative, Ahmed al-Safi, in the holy city of Karbala.
The US State Department condemned the bombing, saying such attacks show the extremist group's "utter contempt for human life and its efforts to sow discord and division among the Iraqi people."
The bomb attacks claimed by IS are seen as an attempt to distract attention as the militants cede territory along front lines in northern and western Iraq.
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