District and Sessions Judge J R Aryan pronounced the punishment to Balwan Khokkar, Girdhari Lal and Captain Bhagmal who were held guilty of murdering five Sikhs during the riots that had broken out after the assassination of then Prime Minister Indira Gandhi on October 31, 1984.
Two other convicts -- an ex-councillor Mahender Yadav and ex-MLA Kishan Khokkar, who were held guilty of rioting, were awarded three-year imprisonment.
Both Yadav and Khokkar were, however, granted bail by the court.
The case, in which the five persons were held guilty pertains to killing of five Sikhs - Kehar Singh, Gurpreet Singh, Raghuvender Singh, Narender Pal Singh and Kuldeep Singh - by the mob in Raj Nagar area in Delhi Cantonment. The victims were members of the same family.
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Congress leader Sajjan Kumar was also an accused in the case but acquitted by the court on April 30 as it held that Kumar deserved "benefit of doubt" since one of the victims and key witness Jagdish Kaur did not name him as an accused in her statement recorded by the Justice Ranganath Mishra panel in 1985.
"It was a planned communal riot in which the victims were isolated. It was religious cleansing...The victims were totally innocent and they had not instigated anyone," CBI prosecutor R S Cheema had submitted.