The ongoing conflict between Serbia and Kosovo: A history of violence and tension.

30 NATO-led peacekeeping troops were injured in clashes with ethnic Serbs in northern Kosovo, where the Serbs tried to take over the offices of one of the municipalities where ethnic Albanian mayors took up their posts last week. The violence was the latest incident as tensions soared over the past weekend when ethnic Serbs in northern Kosovo tried to block recently elected ethnic Albanian officials from entering municipal buildings. Kosovo and Serbia have been foes for decades, with Belgrade refusing to recognize Kosovo's 2008 sovereignty.