Initially , Turkish authorities did not take the attacks Attack seriously , however the attack Attack was followed Arriving up by a raid Attack on a police station in Siirt on 17 August , which was soon followed by an attack Attack that killed Killing three of General Kenan Evren 's Presidential Guards in Yüksekova and an ambush Attack which killed Killing 8 Turkish soldiers in Çukurca , in Hakkâri province .