On 3 August 1947 in Jedlnia-Letnisko, the District Commission for the Investigation of German Crimes in Radom in the person of a member of the Commission, lawyer Zygmunt Glogier, heard the person named below as an unsworn witness. Having been advised of the criminal liability for making false declarations, the witness testified as follows:
| Name and surname | Jan Kurkowski |
| Date of birth | 8 September 1893 |
| Parents’ names | Jan and Agnieszka, née Warchol |
| Place of residence | Jedlnia-Letnisko |
| Occupation | railwayman |
| Criminal record | none |
| Relationship to the parties | none |
I am a permanent resident of Jedlnia-Letnisko. I don’t remember the exact year, but it was in 1941 or 1942 when the Gestapo from Radom carried out mass arrests in the area of Jedlnia- Letnisko. From among my friends, the following were arrested: Dzierko, Piekarscy and his wife, Piotr Wojciechowski, and many others whose surnames I don’t recall at the moment. It was said that the arrests were carried out because it was discovered that some illegal organization was operateding in Letnisko. None of the arrestees returned, and their fate remains unknown. In total, some 50 people were arrested.
The arrests were carried out in the following manner: one night, cars full of Gestapo men came from the direction of Radom. After they got out of their cars, the Gestapo men surrounded the entire village and then, walking from flat to flat and using a list, they arrested people who had been indicated by the sons of Keyn from Radom. One of the Keyn’s names was Erwin, but I don’t recall the name of the other brother. It is beyond doubt that these were the Keyn brothers, as they were known here and had a villa in Jedlnia, where they spent their summers. During these arrests, the Keyn brothers wore Gestapo uniforms. Later on, there were also other arrests in Jedlnia, but only of individual people.