The source who spoke on condition of anonymity told NRT that one fighter of the Hashd al-Ashairi (Tribal Forces) was also wounded.
Earlier on Saturday, Iraq’s Security Media Cell said in a statement that the vehicles belonged to a regiment of Iraqi Army’s 59th Brigade.
Islamic State (ISIS) militants are suspected of responsibility.
The militant group launched several attacks on Saturday morning, including one where three Peshmerga were killed in northern Kirkuk governorate.
Eighteen Iraqis, the majority military personnel, were killed overnight Friday to Saturday in separate jihadist attacks mainly in the greater Baghdad area, according to AFP.
Reporter's code: 50101