istanbul turkish police detain prominent activist businessman osman kavala istanbul ataturk airport turkish media senior european parliamentarian say thursday kavala whose anadolu kultur center say campaign right cultural diversity include kurdish issue take city counter-terrorism police department t24 news website cite lawyer say istanbul police decline comment immediate statement government disturb news osman kavala detain istanbul european parliament rapporteur turkey kati piri write twitter t24 say detain wednesday even return meet southeastern city gaziantep order issue detain seven days police take computers anadolu kultur offices add u.s. state department spokeswoman heather nauert say kavala arrest example alarm trend detention civil society leaders human right defenders journalists academics activists turkey express turkish government concern many occasion trend ... remain major concern tell reporters washington france foreign ministry say thursday worry arrest kavala call one important respect figure turkish cultural scene civil society france like european countries regularly cooperate mr kavala regular interlocutor embassy attentive developments case foreign ministry spokeswoman agnes romatet-espagne tell reporters turkish police detain lead activist airport eu official