BAGHDAD, July 4, 2016 (Xinhua) -- Two men hang a banner at the explosion site in Karrada-Dakhil district in southern Baghdad, Iraq, on July 4, 2016. Iraq began on Monday a three-day national mourning for victims of Sunday's car bombing attacks in the capital city of Baghdad, as the death toll rose to 166. (Xinhua/Khalil Dawood)