World number three Novak Djokovic of Serbia risked political controversy at the French Open after he wrote a letter about Kosovo. The 36-year-old wrote on camera in Serbian: "Kosovo is the heart of Serbia.

Stop the violence" About 25 NATO peacekeepers were wounded while securing three town headquarters in northern Kosovo in clashes with Serbian protesters on Monday. Serbia's president put the army on the highest level of combat alert after the clashes in the town of Mitrovica.