The mass executions began in October 1939 and lasted until April 1940. An exhumation of mass graves was carried after World War II in 1946. Out of total number of 35 graves, 30 were localised of which 26 were exhumed. Only 305 bodies (in two mass graves) were found, the rest of the bodies were burnt by Germans in August–September 1944. Sonderkommandos (forced prison labourers) from Stutthof concentration camp were used to cover up the tracks and were later executed.[4]
^Barbara Bojarska (2001). Piaśnica - miejsce martyrologii i pamięci: z badań nad zbrodniami hitlerowskimi na Pomorzu (in Polish). Wejherowo. ISBN978-83-914705-0-3.{{cite book}}: CS1 maint: location missing publisher (link)