Photo by: Cagdas Erdogan Riot police secure the area after an explosion on a highway overpass near a subway station, wounding five people, in Istanbul, Turkey, Tuesday, Dec. 1, 2015. The explosion was caused by a bomb left on barriers on the overpass, according to Atilla Aydiner, the mayor for Istanbul's Bayrampasa district.(AP Photo/Cagdas Erdogan)
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