New Delhi: Confusion prevailed on Tuesday as to whose office did the Central Bureau of Investigation (CBI) raid - Arvind Kejriwal's or Rajendra Kumar's, who is the principal secretary to the Delhi Chief Minister.

Also Read: LIVE: Arvind Kejriwal insists CBI raided his office, calls PM Narendra Modi a 'psychopath'

The CBI denied raiding Kejriwal's office, but the Delhi CM insisted otherwise and launched a no holds barred attack on Prime Minister Narendra Modi.

The Chief Minister, who is involved in a prolonged tussle with the Centre, accused the Modi government of resorting to vendetta politics and came down heavily on the agency for the raids at Players Building.

CBI raids my office — Arvind Kejriwal (@ArvindKejriwal) December 15, 2015

When Modi cudn't handle me politically, he resorts to this cowardice — Arvind Kejriwal (@ArvindKejriwal) December 15, 2015

Modi is a coward and a psycopath — Arvind Kejriwal (@ArvindKejriwal) December 15, 2015

CBI lying. My own office raided. Files of CM office are being looked into. Let Modi say which file he wants? — Arvind Kejriwal (@ArvindKejriwal) December 15, 2015

राजेंद्र के बहाने मेरे दफ़्तर की सारी फ़ाइल देखी जा रही हैं। — Arvind Kejriwal (@ArvindKejriwal) December 15, 2015

A CBI spokesperson said the searches were being conducted at the office of the Principal Secretary Rajendra Kumar and that details would be shared later.

Sources said that a team of CBI officials went to the Delhi Secretariat, which houses office of Kejriwal and other ministers in the morning and conducted the search on the third floor of the building.

They said the search may be in connection with the multi-crore CNG fitness scam.

Sources said that there were allegations that Kejriwal's Principal Secretary was linked to the scam but the senior IAS officer as well as AAP government have been rejecting the charges.

The third floor of the secretariat also houses Kejriwal's offce.

The AAP government has been locked in a running feud with the Centre over the control of important functions like law and order, police and land.

Meanwhile, the CBI said it has registered a case against Secretary to the Chief Minister, Rajendra Kumar on allegations of abusing his official position by "favouring a particular

firm in the last few years in getting tenders from Delhi government departments."

"After taking warrants, searches are being conducted in the office and residence of Rajendra Kumar. The allegations against Rajendra Kumar were raised by Ashish Joshi, former Member Secretary, Delhi Dialogue Commission," the agency said.