Up to 2,000 Serb protesters marched through the ethnically divided town of Kosovska Mitrovica on Saturday to denounce Kosovo's declaration of independence from Serbia.

The latest demonstration came a day after the U.S. ordered non-essential staff from its embassy in Serbia's capital, Belgrade.

Both the U.S. and European Union asked Serbia for greater protection of their embassies and staff after protesters set fire to the U.S. Embassy in Belgrade on Thursday night.

NATO troops stepped up patrols on Saturday in Kosovska Mitrovica, a day after a violent clash between Kosovo Serbs and security forces.

Protesters threw stones and glass bottles at UN police guarding a key bridge over the Ibar River that separates the city's ethnic groups.

Ethnic Serbians on the bridge attacked and injured a camera operator from Albanian TV, witnesses said.

The vast majority of Kosovo's population is ethnic Albanian, and Serbs represent about 10 per cent of the region's two million people.

Canadians of Serbian origin were planning to hold a protest rally outside the U.S. consulate in Toronto later Saturday.

Organizers said they'll denounce the United States for recognizing Kosovo's declaration of independence, formally approved last weekend.

Similar rallies are scheduled for Sunday in Vancouver and Montreal, and next weekend in Ottawa, Calgary and Edmonton.

Prime Minister Stephen Harper's government has not yet announced its position on the issue.

With files from the Associated Press