Shillong: The Central Bureau of Investigation (CBI) began questioning the Kolkata police chief on Saturday at a highly secured agency’s office, in connection with the chit fund scam cases, officials said.Kolkata police commissioner Rajeev 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.Kumar’s counsel and the two IPS officers were asked to leave the CBI office within 30 minutes, they said.Kumar is being interrogated at the highly secured CBI office at Oakland area in the Meghalaya capital, where three senior CBI sleuths from Delhi reached, on Friday.The Supreme Court on Tuesday directed the Kolkata police chief 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 will not be arrested.The CBI alleged in the SC that Kumar, who was leading the Special Investigation Team (SIT) probe into Saradha chit fund scam, 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 in Shillong ‘to avoid all unnecessary controversy’.CBI officials went to Kumar’s residence in Kolkata to question him on February 3, but their attempt was thwarted by the police, following which chief minister Mamata Banerjee staged a three-day dharna.