On 21 July 2006, on the initiative of Klaus Sternberg, Gunter Demnig laid two stumbling stones for Siegfried and Johanna Lörken, who were deported to Izbica and murdered there.

Siegfried Semmi Lörken was born on 29 July 1885 in the small village of Modschiedl in the Sudetenland. His parents were Leopold and his wife Louise (née Stein). In the First World War Siegfried was a soldier. At the end of November 1918 he moved to Nuremberg, where he worked as a trader.

On 16 March 1921 he married Johanna Löwenthal. Johanna, born in Nuremberg on 21 December 1886, was the daughter of Edmund und Lina (née Dormitzer). Their daughter Edith was born on 12 January 1922. At the instigation of her parents, Edith was able to emigrate to London on 3 February 1939 at the age of 17.

Siegfried und Johanna were deported to Izbica on 24 March 1942 and murdered.