Sibal alleged that probe agencies were following a set pattern by arresting someone and then getting that person to name another individual as accused, whom they want to target.
Sources close to the officer attributed "personal reasons" for his resignation from government service where he had about 15 more years to serve, given the age of superannuation is 60.
The AAP chief claimed that central investigative agencies, at the behest of the BJP, were preparing a fake case against Atishi in the transport department.
Delhi Chief Minister Arvind Kejriwal seeks quashing of CBI arrest in Delhi excise case, following setback from Delhi High Court and ongoing bail proceedings.