FALLUJAH, June 13, 2016 (Xinhua) -- Heavy smoke rises after the U.S.-led coalition warplanes struck Islamic State (IS) militants in Nazal district in Fallujah's city center, some 50 kilometers west of Baghdad, Iraq, on June 13, 2016. At least six militants were killed and 16 others wounded during the bombing. (Xinhua/Sami Jawad)