Ravensbrück was the largest and, after 1939, the only concentration camp solely for women within the German Reich. After liberation in April 1945, there were nearly 50,000 prisoners at Ravensbrück, the majority of them being women. Thousands of women were transported from Ravensbrück to other sites to be killed, however, in early 1945 a gas chamber was constructed at the camp in which up to 6,000 women were gassed before liberation. Inmates also died of malnutrition, forced labour and disease. The camp was a centre for medical experimentation. There was also a small men&rsquos camp in the later years of the war. It is unclear how many people died at Ravensbrück, but the minimum is an estimated 30,000.