The Revenue Divisional Commissioner (North) was asked to conduct the inquiry into the attack on the convoy of Union Textile Minister Santosh Gangwar and Union Minister of state for Food Processing Sadhvi Niranjan Jyoti on June 24, a senior official said.
The RDC has been asked to complete the inquiry and give the report within 60 days, an official in the Chief Minister's Office (CMO) said.
Black flags were also shown to the senior BJP leaders allegedly by the slogan-shouting BJD workers and leaders.
The incident was condemned by leaders of different political parties.
Concerned over the violent incident, Union Home Minister Rajnath Singh had called up Odisha Governor S C Jamir and Patnaik the next day and asked them to ensure safety and security of central leaders visiting the state.