CBI today pleaded before the Delhi High Court that it has got sufficient evidence to prove the involvement of senior Congress leader and former MP Sajjan Kumar in a 1984 anti-Sikh riots case in which six persons were killed. The agency said in its affidavit filed before the court that during investigation sufficient material establishing his involvement has come on record. The CBI said, Mr Kumar instigated the mob, armed with deadly weapons, by making highly provocative speeches. It filed its reply in response to Kumar's plea that the criminal proceedings against him should be quashed. Two cases were registered against the former outer Delhi MP for his alleged involvement in anti-Sikh riots in the aftermath of the assassination of former Prime Minister Indira Gandhi on October 31, 1984.