New Delhi: A team of Central Bureau of Investigation (CBI) would be leaving for Mauritius on Monday in its pursuit to collect information about promoters of Delphi Investment – the company which had purchased Reliance Telecom's 9.9 percent shares in Swan Telecom in December 2007.

The Mauritius visit could prove crucial in the CBI investigation in the 2G spectrum case – in which CBI has already filed two chargesheets - because it has been alleged that Swan was being controlled by the Mauritius-based Delphi Investments.

It is suspected that through Delphi Investments, politicians were paid kickbacks for favours in the entire spectrum allocation exercise.

After getting 2G spectrum licence, Swan sold 50 percent stake to UAE-based telecom company Etisalat for Rs 14,412 crore. If CBI manages to pull out evidence in connection with the Delphi share sale, it would emerge as the biggest bribe ever paid to politicians in the country.

Mawi Investment controls the ownership of Delphi Investment. The probing agency is yet to find out the actual owners of Mawi Investment. The agency also seeks to know the details of transactions in Mawi Investment over the last three years.