MOSCOW, April 11. /TASS/. The retreating German army in the Great Patriotic War left subversion armies behind to explode railway infrastructure, according to archive materials obtained by TASS correspondent.

On the eve of the International Day of the liberation of inmates of Nazi concentration camps, the Federal Security Service (FSB) declassified the archive documents about Nazi crimes during occupation of the region in the years of the Great Patriotic War. They include intelligence data and reports of Smerch counterintelligence dated 1944-1945.

"Facts have been established of late that the German command that retreated under the strikes of our troops left in the liberated territories German officers and men with the task of staging subversion acts in the Red Army rear," the materials said adding they exploded railway bridges, track and stations.