Ratul Puri, the nephew of Madhya Pradesh Chief Minister Kamal Nath, was arrested by Enforcement Directorate on Tuesday morning. Puri has been arrested for his alleged involvement in the Rs 354 crore bank fraud case. On Saturday, the CBI had booked Puri, the then former executive director of Moser Baer, and others in connection with a Rs-354 crore bank fraud case.