Cambodian Prime Minister Samdech Thipadei Hun Manet on June 20 presided over a ceremony at the Techo Koh Thmar X16 military historical site in Tboung Khmum province to mark the 47th commemoration day of the nation’s historical journey leading to the overthrow of the Pol Pot genocidal regime, gathering more than 3,000 local delegates and many other foreign guests.