 It is a Palestinian Sunni-Islamist fundamentalist organization, which is regarded, either in whole or in part, as a terrorist organization by several countries and international organizations, most notably by Israel, the United States and the European Union.Tensions between Fatah and Hamas began to rise in 2005 after the death of Yasser Arafat in November 2004.After the legislative election on 25 January 2006, which resulted in a Hamas victory, relations were marked by sporadic factional fighting.