NOUAKCHOTT, July 24, 2016 (Xinhua) -- A policeman with a police dog walks past a vehicle at the entrance of Nouakchott Convention Center in Nouakchott, capital of Mauritania, on July 23, 2016. The 27th Arab League Summit will be held from July 25 to July 26 in Nouakchott of Mauritania. (Xinhua/Wang Meng)
