Turkey opposition calls for mass protests in Istanbul over Ekrem Imamoglu arrest / Turkey: Istanbul Mayor Ekrem Imamoglu's arrest marks the start of a new authoritarian era / Turkish police detain 10 Istanbul opposition officials over alleged PKK links / Turkish police clash with workers marching to Ankara / Turkish police block workers' march, detain five, sparking hunger strike / Turkish police block workers' march, detain five, spark hunger strike / Turkish police block commemoration of trans hate crime victims / Turkish police brutally attack protests against trustee mayors / Turkish police attack political parties, lawyers for protesting gov't efforts to hijack Van elections / Turkish police shoot dead two 'terrorists' during attack on Istanbul courthouse