Turkish protestors have clashed with police in Istanbul overnight, in some of the worst violence since unrest erupted three days ago. Protesters in Beskitas district tore up paving stones to build barricades, and police responded with tear gas and water cannon. The violence was sparked by plans to build on a city park but have broadened into nationwide anti-government unrest. Protesters say the Turkish government is becoming increasingly authoritarian. They fear Prime Minister Recep Tayyip Erdogan's Justice and Development Party (AKP) is trying to impose conservative Islamic values on the officially secular country and infringe on their personal freedoms. correspondents...