A small blast, possibly from a hand grenade, occurred Friday close to the United Nations' headquarters in Kosovo (search), U.N. police said.

One injured person was taken to a hospital and one car was damaged, U.N. spokeswoman Hua Jiang said. There were no immediate reports of any deaths.

The spokeswoman said the target of the blast was not clear.

It occurred outside the U.N. compound in central Pristina (search), U.N. police spokesman Malcolm Ashby said.

The decision to charge Kosovo's prime minister with war crimes, and his surrender Wednesday to the U.N. war crimes tribunal in The Hague, Netherlands raised fears of renewed violence.

Ramush Haradinaj, one of the leaders of the ethnic Albanian rebellion against Serb rule in Kosovo in 1998-99, has been charged with alleged war crimes committed against Serb and Roma civilians during the conflict, including rape, murder and expulsions.

Kosovo still seethes with ethnic tensions nearly six years after the end of the 1998-99 war between Serbs and ethnic Albanians, and U.N. police and NATO (search) troops were put on alert in the volatile province after Haradinaj's surrender.

Kosovo, which officially remains a province of Serbia-Montenegro (search), has been administered by the United Nations since 1999, following the alliance's war to halt a crackdown by Serb troops on ethnic Albanian rebels.

Its majority ethnic Albanian population wants independence, but the Serb minority insists it should remain part of Serbia.