The CBI began questioning Calcutta police commissioner Rajeev Kumar on Saturday at the highly-secured agency's office in Shillong in connection with the Saradha scam cases, officials said.

Kumar, his counsel Biswajit Deb and senior IPS officers Javed Shamim and Murlidhar Sharma arrived at the probe agency's office at 11 am, they said. Within 30 minutes, the police chief’s counsel and the two IPS officers were asked to leave the CBI office, the officials added.

Three senior CBI sleuths from Delhi reached Shillong on Friday.

The Supreme Court on Tuesday had directed Kumar to appear before the CBI and 'faithfully' cooperate in the investigation of cases arising out of the Saradha chit fund scam, while making it clear that he would not be arrested.

The CBI had alleged in the Supreme Court that Kumar, who was leading the SIT probe into the scam, had tampered with the electronic evidence and handed over documents to the agency, some of which were 'doctored'.

The apex court directed him to appear before the investigating agency at a neutral place 'to avoid all unnecessary controversy'.

CBI officials had gone to Kumar's residence in Calcutta to question him on January 3, but their attempt was thwarted by the police, following which chief minister Mamata Banerjee staged a three-day dharna.