India's efforts to bring back Zakir Naik, the controversial preacher wanted for terror-related activities, have been facing a roadblock for the last seven months, officials of the National Investigating Agency have told NDTV. The Interpol, which normally issues a Red Corner Notice within three weeks, has not even responded to India's request, the officials said. It is possible that the international agency is not satisfied with the case against Zakir Naik, who has made a case that he is being politically persecuted in India, the officials conceded.