"The deployment of additional NATO forces to Kosovo is a prudent measure to ensure that KFOR (the Kosovo Force) has the capabilities it needs to maintain security in accordance with our UN Security Council mandate," said Admiral Stuart B. Munsch, commander of Allied Joint Force Command Naples.

"I want to commend KFOR for taking swift, restrained and professional action to intervene to stop the unrest and to save lives.

"The violence must stop and all sides must stop taking actions to undermine the peace in any and all communities of Kosovo."

NATO said it was deploying the Operational Reserve Forces (ORF) for the Western Balkans, who would be ready to move within seven days.

On top of that, it said, "an additional multinational battalion of reserve forces has been ordered to decrease their readiness-to-deploy status from 14 days to seven days, in order to be ready to reinforce KFOR if necessary".

The European Union's top diplomat, Josep Borrell, earlier urged the leaders of Kosovo and neighbouring Serbia to immediately de-escalate tensions after Monday's violence.

Thirty KFOR soldiers were injured in the clashes with ethnic Serbs protesters, which were sparked by disputed local elections.