Nato's governing body - the North Atlantic Council - was briefed on the situation a day after the alliance announced it was deploying a reserve battalion from Germany to beef up its 6000-strong force in Kosovo, officials said.
"The priority now for (Nato) is to maintain a safe and secure environment," spokeswoman Carmen Romero said.
The violence followed an action by Kosovo police to take control of two disputed border crossings, sparking anger among local Serbs who want the former province to remain part of Serbia. After police withdrew, a mob of Serb militants set one border post ablaze.
On Tuesday, Nato said it would deploy a reserve battalion from Germany to Kosovo to provide immediate relief for soldiers who have been on duty since the crisis began. The unit is made up of about 550 German soldiers and 150 Austrians, the German military said.
The first 50 of the battalion's German soldiers landed Wednesday at the Nato-controlled part of Kosovo's main airport outside the capital Pristina.
The international force originally numbered nearly 50,000 troops when it entered Kosovo in 1999, ending Serb rule in the province.
Kosovo unilaterally declared independence three years ago against strong Serbian opposition. Although its statehood has been recognized by more than 70 nations including the United States and most EU members, Kosovo has been blocked from joining the United Nations.
It also remains in limbo within the European Union because five member states have refused to recognize it.
