A senior police official said Kumar was called to New Ashok Nagar Police station in East Delhi for questioning in the case.
About a month earlier, a case of cheating was registered against Kumar following allegations that he duped his business partner of Rs 6 lakh.
"This is an old matter related to land fraud. Questioning of Kumar is on as of now," Delhi Police Commissioner B S Bassi said this afternoon.
Vinod Kumar had alleged in his complaint to the police that Manoj used to work as a property dealer before venturing into politics.
Vinod claimed that he was Manoj's business partner and had given Rs 6 lakh to him to purchase a plot in November 2012 but that he did not repay the amount.