BERLIN, June 27: (Reuters) – Wolfgang von Schwarzenfeld’s sculptures in a Berlin park were meant to promote world peace, but the 79-year-old German now finds himself at war with a Venezuelan tribe which accuses him of stealing a sacred pink stone known to them as ‘Grandmother.’ The Venezuelan government is championing the Pemon Indians of the ‘Gran Sabana’ region by demanding the return of the polished stone from Berlin’s Tiergarten park – putting the German government in something of a dilemma.