Kolkata: Trinamool Congress supremo Mamata Banerjee has made a big comment on the security breach in Parliament. Before leaving for Delhi today, She said, "What happened in Parliament is undoubtedly serious. The opposition have already raised the issue and that's why TMC leader Derek O'Brien has been suspended and other Congress and DMK MPs have also been suspended. Bengal has nothing to do with this incident. Let there be an impartial investigation. There was a big security lapse in Parliament. The BJP's only aim is to defame Bengal. The Home Minister already admitted that. And this is a very serious matter. Let them investigate the matter.”