New Delhi, Sept 13: The Central Bureau of Investigation summoned businessman Karti Chidambaram for questioning tomorrow. Karti, the son of former Finance Minister P Chidambaram, would be questioned by the agency over the alleged money laundering through his firms in the Aircel-Maxis tie-up in 2008.

The summoning of Karti comes days after he was instructed by the Supreme Court to appear before the CBI in relation to the INX Media Case, where he is accused of receiving irregular FIPB clearance for investment upto Rs 305 crores. In the course of hearing against him, the CBI on Tuesday claimed they have traced 25 companies linked to him abroad.

The charge was denied by senior advocate Kapil Sibal, appearing instead of Karti’s incumbent counsel Gupal Subramanian. Sibal said he would sign a declaration before the top court authorising the CBI and Income Tax department to seize all unaccounted properties of Karti outside India, if they are found.

The CBI, however, dismissed the argument of Sibal saying the companies linked to him are not registered in his name, but through shell companies. Additional Solicitor General Tushar Mehta, appearing on behalf of the agency, said the names of shell companies would soon be revealed by the CBI.

“These properties are being held by Karti in the name of shell companies. The investigation is at a crucial stage,” he said.

However, Sibal accused the CBI of defaming his client by levelling allegations without substantial base. “The mala fide allegation about properties abroad could not be a justification for issuance of lookout notice by the CBI,” the veteran Congress leader told the bench headed by Chief Justice of India Deepak Misra.

P Chidambaram, commenting upon the charges levelled against his son, said a law-abiding citizen is being harassed due to “political vendetta”. “Through my son, they are trying to defame me,” he added.