However, no one was injured in the incident.
Dhananjai Singh was on his way to Khimsar in Nagaur from Lohawat late last night when the unknown assailants hit his vehicle with some object following which the car's windscreen got damaged, SHO Khimsar Bharat Rawat said.
No one was injured in the incident, he said, adding, the attackers fled in a jeep.
An FIR was registered today by one Mohan Singh who was driving Dhananjai Singh's car, he added.
In Jaipur, social justice minister Arun Chaturvedi said that police will do its job in the matter.