sarajevo forensic experts find 86 skulls mass grave near scene massacre bosnian muslims croats serb force early 1992-95 war officials say friday skulls 50 body part find cover rock remote spot near ravine central bosnia country miss persons institute say experts begin search sept hours bosnian war crimes court order exhumations mount vlasic time team say expect find remain around 60 people aug. 21 1992 bosnian serbs tell prisoners detention camp non-serbs near town prijedor would release prisoner exchange instead drive away bus line edge ravine shoot dozen survive become know koricani cliffs massacre tumble jump steep ravine 1992-95 war claim 100,000 live kill part wave ethnic cleanse bosnian serb force try create serb statelet remove bosniaks bosnian muslims croats area forensic experts already identify 117 victims massacre several mass grave sit hope search victims massacre complete today say lejla cengic miss persons institute eleven bosnian serb ex-policemen convict ravine kill include darko mrdja jail 17 years hague-based u.n. war crimes court remainder convict bosnian war crimes court bosnian experts find 86 skulls scene 90s war massacre