Radogoszcz Prison 20101022
As Lodz was about to be over-run by the Red Army, the prison staff began to exterminate all the prisoners. After they began shooting the sick in the hospital they experienced resistance, and decided to lock the entire building and set it alight. Of the 1500 prisoners in the 4 storey part of the building that was burned, only 30 survived, many in a water tank on the top floor.
http://en.wikipedia.org/wiki/Radogoszcz_prison