PRISTINA, Mar 19 (AP): The United Nations accused Serbian officials Tuesday of complicity in the violence in northern Kosovo that left a UN policeman from Ukraine dead and dozens of people hurt.

Larry Rossin, the deputy UN administrator for Kosovo, told reporters in Pristina that "it is clear to us that the violence ... was orchestrated."

At the very least, Rossin said, Serbia's government failed to use its influence to prevent ethnic Serbs in Kosovo from launching the attacks, which left more than 60 UN and NATO forces and 70 Kosovo Serb protesters wounded.

The UN pulled out of the Serb-dominated part of Kosovska Mitrovica because of Monday's violence. Additional US troops trained in riot control were sent to reinforce NATO peacekeepers stationed in Kosovo's north, a NATO official said.