Islamist cleric Metin Kaplan, dubbed the "Caliph of Cologne", sits in a dock during his trial in a high criminal court in Istanbul April 4, 2005. Kaplan, who was extradited to Turkey from Germany in October last year, is wanted on treason charges in connection with a 1998 plot to crash an explosive-laden aircraft into the mausoleum of Kemal Ataturk, founder of the modern Turkish state. REUTERS/Fatih Saribas FS/KS