The agency, which is trying to trace the trail of the alleged bribe money, arrested Khaitan, a businessman and advocate, at 5 am after hours of sustained questioning at his premises which were searched by the ED yesterday.
Later in the day, a special court sent him to seven days custody.
"Khaitan is an important link vis-a-vis the kickbacks in this deal. The records of Italian prosecutors also speak about these links. The agency is probing this," sources in the ED said.
The agency, sources said, suspects the route of stash funds to have originated from Italy and routed through Mauritius and Tunisia to India which was later laundered into the creation of unknown assets.
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ED sleuths, after the searches at two of Khaitan's premises here, have seized jewellery worth Rs one crore and impounded some "important" financial documents as they are also probing his role in connection with an arrested arms dealer in India and a prominent hawala ring leader currently being investigated by tax sleuths.
Khaitan was on the board of Chandigarh-based Aeromatrix and he had resigned from the post after the Italian police started its probe into the chopper deal in 2012. The firm is allegedly a front company for the financial dealings of the chopper deal.