Kolkata (WB), Mar 21 (ANI): In BJP’s manifesto for the upcoming West Bengal Assembly elections, Amit Shah promised to make efforts in the direction of making Bengali one of the official languages, at international level in the United Nations. Home Minister Amit Shah also promised investigation in all the political killing cases, irrespective of their party. Home Minister said, “We will constitute an SIT to investigate cases of political killings and take strict action against those responsible. We will provide up to Rs 25 lakh as a rehabilitation package to each of the victims of political violence in West Bengal.”