Riot police chase protesters in central Istanbul May 31, 2014. Turkish police on Saturday used teargas in central Istanbul to disperse protesters seeking to mark the one-year anniversary of the start of the biggest anti-government demonstrations in decades. Several hundred people gathered on streets leading to Taksim Square, shouting for the government's resignation, when police fired teargas at the crowd, which quickly scattered. REUTERS/Murad Sezer (TURKEY - Tags: POLITICS CIVIL UNREST ANNIVERSARY)