Khatyn became a symbol of mass killings of the civilian population during the fighting between partisans, German troops, and collaborators. In 1969, it was named the national war memorial of the Byelorussian SSR. Among the best-recognized symbols of the memorial complex is a monument with three birch trees, with an eternal flame instead of a fourth tree, a tribute to the one in every four Belarusians who died in the war. There is also a statue of Yuzif Kaminsky carrying his dying son, and a wall with niches to represent the victims of all the concentration camps, with large niches representing those with more than 20,000 victims. Bells ring every 30 seconds to commemorate the rate at which Belarusian lives were lost throughout the duration of the Second World War.