The incident on Sunday evening took place in Zubin Potok, a town where local ethnic Serbs have been manning road barricades for the past two weeks and where tensions have been running high.A statement said no one was injured and “we are working to establish all the facts.”Serbia's defense minister and the army's chief of staff traveled to the border with Kosovo, praising the combat readiness of Serbian troops and their firepower, including howitzers and other military hardware.Mojsilovic described the situation as “serious," adding that it requires the “presence of the Serbian army along the administrative line” with Kosovo, state RTS television reported.Serbia has asked KFOR to deploy up to 1,000 of its troops in the Serb-populated north of Kosovo, to protect Kosovo Serbs from alleged harassment by ethnic Albanians, who are the majority in the country.Adding to the tensions, Serbian Patriarch Porfirije was denied entry into Kosovo at a border crossing on Monday, after saying he would like to deliver a peace message for Serbian Orthodox Christmas, which is celebrated on Jan. 7."