Kosovo’s Prime Minister urged NATO peacekeeping troops to intervene after minority Serb protesters blocked roads and unknown gunmen exchanged fire with police over the weekend amid rising ethnic tensions in the country’s restive north.At a news conference in Kosovo’s capital Pristina on Sunday, Prime Minister Albin Kurti asked the Kosovo Force (KFOR), a NATO-led international peacekeeping force, to guarantee “freedom of movement,” as he accused “criminal gangs” of blocking roads.Following the flareup, the EU, the United States and NATO asked for restraint by both parties and demanded the removal of barricades.Serbian President Aleksandar Vucic said Saturday that Belgrade would ask KFOR to let Serbia deploy military and police in Kosovo, but acknowledged there was no chance of permission being granted.Serb mayors in northern Kosovo municipalities, along with local judges and some 600 police officers, resigned last month in protest over a Kosovo government move to replace Belgrade-issued car license plates with ones issued by Pristina."