The incident was reported around 1.30 AM and the diplomat is suspected to be driving in an inebriated state when he was heading southward on Shanti Path, said a senior police official.
A case of rash driving, obstructing public servant in discharge of public functions, assaulting public servant and causing grievous injury has been registered in connection with the incident, but no one has been named in the FIR, said Joint Commissioner of Police (Southwest) Dependra Pathak.
The police have also provided the image of the diplomat, obtained from CCTV grabs, to the ministry for the verification process. They are presently awaiting the ministry's response, a senior official said.
Once the identity and position are verified, it shall also be checked to what extent the concerned diplomat enjoys immunity, said the official.
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The diplomat's car then allegedly rammed into a police barricade in the area and when the officials managed to make him come out of the vehicle, it appeared that the diplomat sustained injuries too.
The diplomat then entered into an argument with police officials and allegedly assaulted a constable on duty. He made a phone call and another person came to the spot who later escorted the diplomat back to his residence.
Police are likely to submit a case report to the Ministry of Home Affairs within 24 hours, he added.