An officer who investigated CBI number two Rakesh Asthana and was transferred to Port Blair "in public interest", revealed today in the Supreme Court what he called strong evidence of the officer's corruption. AK Bassi has submitted in court details of WhatsApp messages and calls that he alleges prove Mr Asthana took bribe from a businessman, Sathish Sana, who wanted to be spared CBI summons in an investigation. Mr Bassi claims the call records establish a link between Rakesh Asthana and Manoj Prasad, a Dubai-based man who was allegedly the go-between in the bribe deal. Prasad was arrested earlier this month. He is the son of former RAW (Research and Analysis Wing) director Dineshwar Prasad.