Congress leader Digvijay Singh called controversial preacher Zakir Naik 'messenger of peace' , in a 2012 video. However, Singh has now appealed the government to launch a probe against Naik if there were evidence against him. Zakir Naik the preacher was followed by Dhaka restaurant attackers, who killed 22 people.br br Subscribe to OneIndia News Channel for latest updates on movies and related videos.