The Central Bureau of Investigation on Wednesday began interrogating industrialist Ashok Todi in connection with the mysterious death of computer graphics teacher Rizwanur Rehman, who married Todi's daughter Priyanka.

Cricketer Snehasish Ganguly, elder brother of former Indian cricket team captain Sourav Ganguly [Images], was also called for interrogation by the investigating agency at its office in Nizam Palace in Kolkata.

Todi's interrogation by CBI joint director Arun Kumar and DIG S K Golcha began at 6.30 am, agency sources said, adding uncle of Rizwanur's widow Priyanka Todi, Anil Sarogi, was also being interrogated. Former city police chief Prasun Mukherjee was also likely to be interrogated later, the sources said.

Priyanka and her mother had already been interrogated by the central investigating agency. The agency, yesterday, had interrogated four top city police officers, including two former deputy commissioners Gyanwant Singh and Ajay Kumar, who were removed earlier this month by the state government following allegations that they had pressurised Rizwanur and his wife to part.

"The IPS officers have said a lot of things," Kumar said last night after the interrogation.