The CBI is trying to locate Kolkata police chief Rajeev Kumar to question him in connection with Rose Valley and Saradha ponzi scams and it might arrest him as the last resort, officials said.

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The IPS officer, who led a Special Investigation Team of West Bengal Police probing the scams, has to be questioned regarding missing documents and files but he is not responding to notices to appear before the agency, they said.

Kumar, a 1989 batch IPS officer of West Bengal cadre, did not even attend a meeting with Election Commission officials who had gone to Kolkata to meet him regarding election preparedness, sources said.

When contacted, his staff claimed Kumar had come to office Friday but had left.

"There is very little chance that he will come to office now. You can try on Monday or call his residence," his office staff told PTI over phone.

The number of his residence given by his staff did not ring and the calls made to his mobile number remained unanswered.

The officials said Kumar apparently became apprehensive of his arrest after Bengali film producer Shrikant Mohita was taken into custody.

According to some eyewitness accounts, Kumar was spotted in a book fair some days back.