 Historians have documented evidence that as Germany's defeat became imminent and Nazi leaders realized they would most likely be captured and brought to trial, great effort was made to destroy all evidence of mass extermination. Heinrich Himmler instructed his camp commandants to destroy records, crematoria, and other signs of mass extermination. As one of many examples, the bodies of the 25,000 mostly Latvian Jews whom Friedrich Jeckeln and the soldiers under his command had shot at Rumbula (near Riga) in late 1941 were dug up and burned in 1943. Similar operations were undertaken at Belzec, Treblinka and other death camps. In the infamous Posen speeches of October 1943 such as the one on October 4, Himmler explicitly referred to the extermination of the Jews of Europe and further stated that the genocide must be permanently kept secret:
