The victim has been identified as Shivpuri-resident Manoj Aggarwal (37), who has a clinic in Shahdara, police said.
Yesterday, around 5:45 PM when the doctor was going to his clinic from home with his assistant and 68-year-old father, two men on a motorbike came speeding and hit his car from behind, said a senior police officer.
When the doctor protested, the men started abusing him. They were accompanied by their friends who were on a scooty.
They also threatened the doctor with dire consequences if he reported the matter to police.
He filed a complaint with the police and an FIR against the unidentified men has been registered at the Krishna Nagar police station.