Warsaw, 20 December 1945. Judge Halina Wereńko, delegated to the Commission for the Investigation of German Crimes, interviewed the person specified below as a witness. Having advised the witness of the criminal liability for making false declarations and of the gravity of the oath, the judge swore the witness in accordance with Art. 109 of the Code of Criminal Procedure. The witness testified as follows:
| Name and surname | Władysław Kosakiewicz |
| Date of birth | 18 September 1879 |
| Occupation | railway pensioner |
| Names of parents | Jan and Małgorzata |
| Place of residence | […] |
| Religion | Roman Catholic |
I am the owner of the house at Bema Street 54 in Warsaw. During the uprising, I left the city on 7 August 1944. After I returned to Warsaw in May 1945, I found that my house had been burnt down. In the rubble I found human bones: a jaw, forearm bones, shinbones and so on. Apart from that there were a large number of small charred bones in the ash. I collected all of the larger bones in one place.
While still in Germany, before I came back to Poland, I was told by people from Warsaw that on 8 August 1944 German soldiers had put up a Red Cross flag on my house and had been bringing groups of frail people there – women, children and cripples – whom they had earlier separated from civilians who were being displaced from Warsaw through the West Railway Station [Dworzec Zachodni]. Then, reportedly, 60 or 70 persons had been burnt alive in my house. In Warsaw, it was Helena Woźniak who told me about this.
At that the report was concluded and read out.