By Nedim Dervisbegovic SARAJEVO, Feb 16 (Reuters) - A former Bosnian Serb paramilitary leader was jailed for 34 year on Friday for committing war crimes, the longest sentence yet given by a Bosnian court. Gojko Jankovic, 52, was found guilty on seven counts of crimes against humanity for acts committed during a "ethnic cleansing" campaign early in the 1992-95 war to purge eastern Bosnia of Muslim population. Presiding Judge Zorica Gogala at the war crimes court said "the number and frequency" of the crimes in and around the eastern town of Foca required the long prison term. The previous longest sentence was 24 years. Jankovic committed multiple rape and sexual enslavement of teenage girls as young as 12. The court heard how he had lead a group of 20 soldiers who attacked a group of Muslim civilians hiding in the woods. Some were instantly killed and seven of them were detained, beaten and than executed. The one-time police commander was also found guilty on five counts of rape and torture of several women, alone and with other men. Jankovic, a father-of-three, once allowed a group of 10 soldiers to rape one women, the court was told. Gogala said Jankovic and another man had kept young women as "sex slaves" for six months until January 1993 and that he had also raped a 12-year-old girl. The father of one of the raped teenagers, who did not want to be named, said no punishment was severe enough for Jankovic. "It's in God's hands," he told reporters. "Still, we are satisfied because this is the highest sentence so far." Jankovic, who intends to appeal, was one of nine war crimes suspects transferred from the Hague for trial at Bosnia's war crimes court, which has already sentenced two Bosnian Serbs for crimes in Foca. The town was one of several across Bosnia that have become symbols of large-scale atrocities against Muslims by Bosnian Serb forces during their onslaught in the spring and summer of 1992.