About 200 ethnic Serbs set a customs post ablaze on Wednesday at Kosovo’s northernmost border with Serbia.
It came after Kosovo’s special police withdrew from the area. NATO troops attempted to quell the violence but came under fire as they did so.
Kosovo forces had moved into the ethnic Serb enclave to enforce a government ban on all Serbian goods. The blockade was in retaliation to Serbia banning Kosovan exports.
A memorial service has been also held for the 31-year-old Kosovan police officer, who died in Tuesday’s operation after being shot in the head.
The EU and the United States strongly criticised the intervention; there are around 6,000 Western troops on the ground in Kosovo to keep the peace.
Kosovo declared its independence from Serbia in 2008. It has been recognised by nearly 80 countries