MERSIN The co-mayors of the southern city of Mersin 's Akdeniz district, Hoşyar Sarıyıldız and Nuriye Arslan of the Peoples’ Equality and Democracy Party ( DEM Party ), were detained on Dec. 10 as part of a terrorism-related investigation. DEM Party municipal council members Özgür Çağlar, Neslihan Oruç, Yakup Danış and Hikmet Bakırhan were also taken into custody. The investigation led by the chief public prosecutor's office in Mersin alleges the group engaged in terrorist propaganda,