CBI sources said although the Nangloi case was registered by Delhi Police in 1992, the investigating agency was handed over this case only last year and it plans to quicken the probe process to file the charge sheet.
The sources said the name of the Congress politician along with five others was in the list of accused but the police had later allegedly dropped Kumar's name from its FIR.
On the issue of filing an appeal against the acquittal of Kumar in a '84 riots case, they said the agency is likely to wait till the court pronounces verdict on quantum of sentence for those declared guilty in the case.
District and Sessions Judge J R Aryan had on April 30 acquitted the Congress leader in a 29-year-old riots case in which he was accused of murder and of instigating a riotous mob that killed five Sikhs in Delhi's cantonment area.