Other acts of violence which are not always committed against adherents of particular religions such as war, torture, and ethnic cleansing, may take on the qualities of religious persecution when one or more of the parties which are involved in them are characterized by their religious homogeneity; an example of this occurs when conflicting populations that belong to different ethnic groups also belong to different religions or denominations. The difference between religious and ethnic identity might sometimes be obscure (see Ethnoreligious); nevertheless, cases of genocide in the 20th century cannot be fully-explained by the citation of religious differences. Still, cases such as the Greek genocide, the Armenian genocide, and the Assyrian genocide are sometimes seen as cases of religious persecution and as a result, the lines between ethnic and religious violence are sometimes blurry.