(Additional reporting by Malini Menon, Aradhana Aravindan, Arup Roychoudhury, Satarupa Bhattacharjya, Annie Banerji, Matthias Williams, Anurag Kotoky, Swati Bhat, Harichandan Arakali, Manoj Kumar and Rajesh Kumar Singh; Writing by Ross Colvin and Tony Munroe; Editing by John Chalmers)
