It would be difficult to exceed the horror shown in the photos, which feature burned, maimed and scorched body parts. The victims are scarcely even recognizable as human beings. Turkish-Kurdish human rights activists believe the people in the photos are eight members of the Kurdistan Workers’ Party (PKK) underground movement, who are thought to have been killed in September 2009.

In March, the activists gave the photos to a German human rights delegation comprised of Turkey experts, journalists and politicians from the far-left Left Party, as SPIEGEL reported at the end of July. Now Hans Baumann, a German expert on photo forgeries has confirmed the authenticity of the photos, and a forensics report released by the Hamburg University Hospital has backed the initial suspicion, saying that it is highly probable that the eight Kurds died “due to the use of chemical substances.”

Did the Turkish army in fact use chemical weapons and, by doing so, violate the Chemical Weapons Convention it had ratified?