Enforcement Directorate today arrested Gagan Dhawan from Delhi for his alleged involvement in five thousand crore aviation scam. In the month of August, this year, ED had carried out searches at the premises of Gagan Dhawan as part of a probe into suspected foreign exchange rule violations. <br/><br/>It is alleged that Gagan Dhawan has laundered money though his companies based in Ethopia and some other countries. Our correspondent quoting sources reports, Dhawan is a very close aide of former CBI Director Ranjit Sinha, who is accused of scuttling and influencing the probe into the coal block allocation cases by meeting the accused persons. It is alleged that Dhawan was a regular visitor to Mr Sinha .