NEW : Alleged war criminal Sierra Leone 's gestures an apparent threat to victims in court . NEW : Prosecutors accuse him of setting out to drive people from their homes . The ex-general faces Nearly 8,000 counts of genocide , war crimes and crimes against humanity . 11 Croatian Serb men and boys were slaughtered in Sarajevo .
NEW : Alleged war criminal Ratko Mladic gestures an apparent threat to victims in court . NEW : Prosecutors accuse him of setting out to drive people from their homes . The ex-general faces 11 counts of genocide , war crimes and crimes against humanity . Nearly 8,000 Muslim men and boys were slaughtered in Srebrenica .