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A helicopter flies over the site of an extinguished forest fire in Bilahe Beidahe Forest in the Greater Hinggan Mountains, in north China's Inner Mongolia Autonomous Region, May 5, 2017. A forest fire was extinguished Friday after burning for three days in the region. More than 9,400 firefighters, police and civilians battled the fire that broke out here on Tuesday. (Xinhua/Lian Zhen)