Survivors and veterans have been gathering at what was Buchenwald Concentration Camp to mark the 70th anniversary of its liberation on April 11, 1945.
The clock at the site, near Weimar in Germany, showed 3.15 pm, the exact time the camp was liberated by US troops.
A quarter of a million people were imprisoned at Buchenwald between 1937 and 1945, some 56,000 of whom died.
Inmates included Jews, Soviet prisoners of war, political prisoners, homosexuals, Sinti and Roma and Jehovah’s Witnesses.
Prisoners had to endure humiliation, starvation, coldness and disease. Many were worked to death, others died in medical experiments or were murdered arbitrarily.