Additional District Judge Ehsan Ullah Khan held Rajkumar, his brother Devendra Singh and Om Prakash, Rakesh Singh, Rajendra and Nankuh guilty and sentenced them to life in prison, prosecution said here.
Seven other accused died during the pendency of the case.
In a group clash in November 1997, two persons- Fakere and Munna Singh- were killed in indiscriminate firing from licenced firearms, the prosecution said.
Case had been lodged against 13 people.
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