From February to May 1942 I was responsible, with my men, for the cordonong measures necessary for the gas-van operations. We were under orders fom Blobel and his successor, Dr. Weinmann. As I remember, there were five or six such operations; they took place about every three weeks. I don't know where the van was stationed. But I remember having seen it several times at the prison in Kharkov. It was there that my men and I were ordered to form a cordon outside the prison. The van entered the prison from the rear. I sometimes also saw how Russian civilians - men and women - were loaded into it. The gas van looked like a large moving van. The driver was a man named Findeisen, who also belonged to Sonderkommando 4a."