In the northern town of Zvecan, some 70 protesters -- significantly fewer than crowds seen on previous days -- rallied outside the town hall, sealed off with barbed wire and encircled by NATO-led peacekeepers (KFOR) in full riot gear.
United States Secretary of State Antony Blinken urged both Pristina and Belgrade to ease tensions, warning they were putting aspirations of European integration at risk.
"We call on the governments of Kosovo and Serbia to take immediate steps to de-escalate tensions," Blinken told reporters Thursday at NATO talks in Oslo.
Kosovo police said two ethnic Albanian men were injured in an attack near a square on the Serb-populated part of the ethnically divided city of Mitrovica.
"The victims were attacked by a group of criminals who were masked and organised for the attack," adding that they sustained "injuries and were sent for medical treatment".
In Zvecan, a KFOR armoured vehicle was parked near the road leading to the town hall, a move requested on Wednesday by a local Serb party after masked protesters smashed windows on two Kosovo police cars in the town centre, injuring an officer.
On Monday, NATO-led peacekeepers armed with shields and batons clashed with protesters throwing rocks, bottles and Molotov cocktails. Thirty peacekeepers and more than 50 demonstrators were injured.
Several hundred people rallied in the ethnic-Albanian populated southern part of Mitrovica, but despite announcements of "marching" towards the Serb neighbourhood, the demonstrators dispersed after half an hour.
They carried Albanian flags and chanted "Mitrovica cannot be divided", while police equipped with riot gear blocked the road leading to the bridge that separates the northern and southern parts of the city.