On May 21, 1945, a unit of the Polish Home Army (Armia Krajowa, AK), led by Colonel Edward Wasilewski, attacked a Soviet NKVD camp located in Rembertów in the eastern outskirts of Warsaw. Hundreds of Polish citizens had been imprisoned there, including members of the Home Army and other members of the underground resistance. Prisoners at the camp were being systematically deported to Siberia. As a result of the attack, all of the Polish political prisoners were freed from the camp by the pro-independence resistance.