The Central Bureau of Investigation (CBI) raided as many as 14 residential premises owned by former Union Finance Minister P Chidambaram and his son Karti Chidambaram.
The properties raided included those in Chennai and Sivaganga in Tamil Nadu, and in Mumbai, Delhi and Gurgaon.
The raids started on Tuesday morning at Karti Chidambaram's house and other places and went on for almost seven hours, after which the former finance minister's son was led by the officials to a nearby office.
Before boarding the car, Karti alleged that the raid was politically motivated and that the investigators were not able to lay their hands