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The incident occurred during a protest led by BJP leader Ramesh Bidhuri.
Bibhav Kumar has been under police custody since Saturday.
Aam Aadmi Party leaders have questioned BJP if they thought Kejriwal's parents were involved in the alleged assault.
Security beefed up in Delhi, govt says no need to panic.
Police have allowed the rally to take place with certain conditions, including no march, no tractor-trollies, and no weapons in central Delhi.
The Delhi Police has refuted the allegation made by Aam Aadmi Party leader Atishi.
People in the area, in response, blocked the road and demanded action against the policeman, which led to the stepping up of security in the area to maintain the law and order situation.
The order prohibited any type of rally or procession and blocking of roads and passages.
Meanwhile, the Chief Minister's Office (CMO) said it is ready to receive notice but police are not giving it.
The section of murder was added to the case on Friday and one person was arrested in connection with the case, an official said.