Kolkata-based businessman Kashinath Tapuria, an alleged aide of Pune's stud farm owner Hasan Ali Khan, arrested for massive money laundering and tax evasion, was on Thursday questioned by the Enforcement Directorate (ED).
Tapuria appeared before the ED's at its office in south Mumbai where he was questioned and allowed to go after a few hours, officials said.
According to the ED, Khan had invested money in over 14 companies owned by Tapuria.
The businessman had, however, refuted the allegation that he had partnership or links with Khan.
ED officials had last week conducted searches at the residences of Tapuria in Kolkata.