The special court also slapped Rs 5, 000 fine on each of them.
As many as 40 persons were made accused in the case in 1992. While nine of them died during the trial, 16 were acquitted.
The remaining 15 were convicted yesterday by the court.
As many as 17 FIRs were lodged in connection with the incident and this is the first verdict, while rest cases are still pending in court.
In June 1992, 16 people were killed while several others were left injured when the accused attacked Satyanagar village in Kumher town.
