A report of the National Committee of Croatia for the investigation of the crimes of the occupation forces and their collaborators , dated November 15 , 1945 , which was commissioned by the new government of Yugoslavia under Tito , stated that 500,000-600 ,000 people were killed at the Jasenovac complex . A report of the National Committee of Croatia for the investigation of the crimes of the occupation forces and their collaborators , dated 15 November 1945 , which was commissioned by the new government of Yugoslavia under Josip Broz Tito , stated that 500,000-600 ,000 people were killed at the Jasenovac complex .