Speaking to reporters, Tharoor said, "As far as we are concerned, we are pursuing what we need to do. Our colleagues in the home ministry are working very hard on this dossier.
"The issue matters to us. We want to see everyone involved in the 26/11 (strikes) to be brought to justice. We are not letting anyone off the hook and we are not letting down our guard," he said.
"The ministries were dealing very seriously with matters connected with the Mumbai carnage," he added.