istanbul turkish police detain 54 staff university shut attempt coup last year blame u.s.-based islamic preacher fethullah gulen state-run anadolu news agency say wednesday say police arrest warrant total 171 academics staff istanbul former fatih university regard close tie gulen cleric deny involvement fail putsch july 15 2016. fatih university shut state decree follow coup attempt anadolu say staff find users bylock encrypt message application government say commonly use gulen supporters since coup attempt 50,000 people include civil servants security personnel jail pending trial 150,000 suspend dismiss job right group say crackdown exploit muzzle dissent government say measure necessary due security threats turkey face since putsch 250 people kill turkey detain 54 former university staff gulen-related operation anadolu