Independence of Kosovo
He called for an immediate calming of tensions.
"It's important to reduce tensions, restore a peaceful atmosphere & allow for freedom of movement", Lajcak said on Twitter.
Lajcak, who is visiting Belgrade, emphasizes that he talked about the situation in the north of Kosovo and Metohija with the ambassadors of the European Union.
The authorities deployed special police units on Monday morning in Serb-majority northern Kosovo after hundreds of Serbs blocked roads near the Jarinje border crossing point and in the municipality of Zubin Potok in protest at the government's decision to make them use Kosovo vehicle licence plates instead of Serbian ones.