As tensions rose, Croatia declared independence on 25 June 1991. However, the full implementation of the declaration only came into effect on 8 October 1991. In the meantime, tensions escalated into overt war when the Yugoslav People's Army (JNA) and various Serb paramilitary groups attacked Croatia. By the end of 1991, a high-intensity conflict fought along a wide front reduced Croatia's control of only about two-thirds of its territory. The various Serb paramilitary groups then began pursuing a campaign of killing, terror, and expulsion of the Croats in the rebel territories, killing thousands of Croat civilians and expelling or displacing as many as 400,000 Croats and other non-Serbs from their homes. Meanwhile, Serbs living in Croatian towns, especially those near the front lines, were subjected to various forms of discrimination. Croatian Serbs in Eastern and Western Slavonia and parts of the Krajina, were also forced to flee or were expelled by Croatian forces, though on a restricted scale and in lesser numbers. The Croatian Government sought to stop such occurrences and were not a part of the Government's policy.