Gunmen have taken a Turkish prosecutor hostage in Istanbul. <br /><br /> The far-left Revolutionary People’s Liberation Party-Front (DHKP-C) has published a picture showing the man with a gun to his head.<br /><br /> The group has threatened to kill him if their demands are not met. <br /><br /> Special forces have evacuated the courthouse building where the man was seized.<br /><br /> The prosecutor is leading an investigation into the death of a teenager who was injured during anti-government protests in 2013 and later died. <br /><br /> His captors want a police officer they blame for Berkin Elvan’s death to confess on TV and charges against those who attended demonstrations for the teenager to be dropped. <br /><br /> Prime Minister Ahmet Davutoglu met with current and former interior and justice ministers at the ruling AK Party headquarters in Ankara to discuss the hostage taking, according to officials. <br /><br /> The United States, European Union and Turkey list the DHKP-C as a terrorist organisation. It was behind a suicide bombing at the US E
