According to [link|http://www.amnesty-usa.org/nato_report/| Amnesty Intetnational]:
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NATO bombs are believed to have killed approximately 500 civilians during NATO's campaign against the Federal Republic of Yugoslavia (March 25 to June 10, 1999). During and after the bombing campaign, Amnesty International and other human rights organizations repeatedly raised questions regarding specific attacks in which civilians died. In most cases, NATO said it was investigating, but never produced full answers to the questions it was asked.
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Plus, 98 more people died from land mines left by that compain ([link|http://www.cicr.org/icrceng.nsf/4dc394db5b54f3fa4125673900241f2f/09782054ef7c832441256921004bc280?OpenDocument| Federal Republic of Yugoslavia/Kosovo ]).
This is against [link|http://archive.nandotimes.com/Kosovo/story/general/0,2773,60921-96952-692085-0-nandotimes,00.html|~10,000 ] killed in Kosovo by Serbs before and during the campain.