Serbia increases military presence following ethnic clashes in Kosovo.

Serbia's border police have been put on high alert after clashes between police and ethnic Serbs in Kosovo. Serbia's defence minister has called on NATO-led Kosovo forces to guarantee security inside Kosovo. Ethnic tensions in northern Kosovo have been rising, with ethnic Serbs trying to block recently-elected ethnic Albanian officials from entering municipal buildings. The US condemned Kosovo's government for using police to forcibly enter municipal buildings. Any attempt by Serbia to send its troops over the border would mean a clash with NATO troops stationed there.