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In page Kosovo Liberation Army:

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After the end of the Kosovo War in 1999 with the signing of the Kumanovo agreement,[1] a 5-kilometre-wide Ground Safety Zone (GSZ) was created. It served as a buffer zone between the Yugoslav Army and the Kosovo Force (KFOR).[2][3] In June 1999, a new Albanian militant insurgent group was formed under the Liberation Army of Preševo, Medveđa and Bujanovac (UÇPMB), which started training in the GSZ.[4][5] The group began attacking Serbian civilians and police, which escalated into an insurgency.[citation needed]