The SC had taken suo-motu cognisance of a letter written by Hyderabad-based NGO to Chief Justice of India Hl Dattu. The NGO had also annexed nine videos of separate sexual offences being circulated on social media in a pen drive. The apex court had ordered CBI to probe these cases. Sources said Sahu has been arrested in the case where two males and a woman are seen engaged in sexual act in an old video clip. Besides this case, the agency has registered six FIRs of alleged gangrape and one FIR of rape. The agency has also registered a Preliminary Enquiry to probe a video in which some children are being thrashed by unknown persons.