Members of special security forces stand outside the main courthouse in Istanbul, Turkey, Tuesday, March 31, 2015 (Photo: AP)

Members of special security forces enter the main courthouse in Istanbul, Turkey, Tuesday, March 31, 2015 (Photo: AP)

Members of special security forces prepare outside the main courthouse in Istanbul, Turkey, Tuesday, March 31, 2015 (Photo: AP)

Turkish riot police stand guard in front of the Justice Palace in Istanbul March 31, 2015 (Photo: Reuters)

A gunman poses with Prosecutor Mehmet Selim Kiraz with a gun on his head after being taken hostage in his office in a court house in Istanbul March 31, 2015 (Photo: Twitter)

A gunman poses with Prosecutor Mehmet Selim Kiraz with a gun on his head after he was taken hostage in his office in a court house in Istanbul March 31, 2015 (Photo: Twitter)

A member of the DHKPC with the kidnapped prosecutor March 31, 2015 (Photo: Twitter)

A gunman poses with Prosecutor Mehmet Selim Kiraz with a gun on his head after being taken hostage in his office in a court house in Istanbul March 31, 2015 (Photo: Twitter)