CBI Director Anil Sinha today sought to dismiss claims that the premiere investigating agency of the country was acting as a political tool and asserted that during his tenure no political leader had contacted him to seek any favour. Participating in a private news channel program in New Delhi, Mr Sinha said efforts were on to bring back Dawood Ibrahim with all the agencies of the government working for it. <br/><br/>Mr Sinha however added that if similar cooperation is received from other countries, efforts to bring Dawood will also be successful. He also disclosed that it was a six-month-long operation during which Rajan was located and brought back to face the law in the country.