Enric Marti

"What he talked about as a professional sniper was the tactics of sniping, about the weapons that were used, the sniping locations that the Serb forces used - literally behind this museum - and it's a really chilling account of how a professional sniper looks and how obviously these were deliberate attacks on civilians," Lowe said.

'Watch Out, Sniper', a multimedia exhibition documenting the wartime siege of the Bosnian capital through photographs, research into Hague Tribunal archive material, witness testimonies and 3D modelling, opens at the Historical Museum of Bosnia and Herzegovina in Sarajevo on Thursday evening.