A crowd of Serbs in the northern Kosovo town of Mitrovica attacked a police station this morning, a United Nations official said.
"This is a riot situation. They are behaving very aggressively, two people are injured and one police car is burning," Mr Dmitry Karportsev, spokesman for the UN police in Kosovo, said by telephone.
"Our people are locked in Mitrovica North police station," he said. The injured were a UN police officer and a soldier with the multinational peacekeeping force.
Mr Karportsev said the riot, involving about 150 people, broke out after police detained two suspects in the Serb-dominated northern part of the city. The pair were suspected of assaulting two UN police officers.