The National Investigation Agency (NIA) has been handed over the probe into the death of Thane-based businessman Mansukh Hiren whose body was found in a creek days after a vehicle laden with explosives was parked near the Mumbai residence of industrialist Mukesh Ambani, officials said on Saturday.

The NIA is already probing the case related to the recovery of a Scorpio SUV, parked near Ambani's residence 'Antilia', with gelatin sticks and has arrested an assistant police inspector, Sachin Vaze.