Sameer Wankhede, the senior Narcotics Control Bureau (NCB) officer investigating a number of Bollywood celebrities including megastar Shah Rukh Khan's son Aryan Khan, has sought protection from legal action fearing "being framed" falsely with "ulterior motives". Mr Wankhede wrote to the Mumbai police chief saying threats of jail and dismissal have been issued against him by "highly respectable public functionaries".