DRI officials questioned Rahat, his manager Maroof Ali, and his event Manager Chitresh Srivastava on Thursday.
Rahat and his manager Maroof were caught at IGI airport for carrying undeclared dollars and cheques on February 14.
According to the sources, the money he was carrying was received for his seven performances. On the basis of information, the investigating agency carried out raids at forex dealers premises in Andheri.
DRI officials have already conducted searches at the premises of "Eyeline Telefilm and Events" in Mumbai, owned by Chitresh, elder brother of Bollywood singer Aadesh Shrivastava.
The Income Tax department will also find the source of the money seized from the firm's premises.
Source: Times of India
