ISTANBUL Serdar Tunagur, the ringleader of the terrorist organization PKK in Portugal, was apprehended during a joint operation by the Turkish National Intelligence Organization and Istanbul Provincial Security Directorate. According to security sources, Tunagur, who previously engaged in subversive activities in support of the PKK, actively took part in many actions on behalf of the terrorist organization in Portugal. Tunagur was arrested in Istanbul during the joint operation and later sent